Base | Representation |
---|---|
bin | 101011111001… |
… | …1000011011000 |
3 | 1121022022112010 |
4 | 1113303003120 |
5 | 21343000030 |
6 | 2141145520 |
7 | 366425664 |
oct | 127630330 |
9 | 47268463 |
10 | 23015640 |
11 | 11a9aa9a |
12 | 785b2a0 |
13 | 49cac2b |
14 | 30b18a4 |
15 | 20496b0 |
hex | 15f30d8 |
23015640 has 128 divisors (see below), whose sum is σ = 74649600. Its totient is φ = 5660160.
The previous prime is 23015633. The next prime is 23015687. The reversal of 23015640 is 4651032.
It is a happy number.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85426 + ... + 85694.
It is an arithmetic number, because the mean of its divisors is an integer number (583200).
Almost surely, 223015640 is an apocalyptic number.
23015640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 23015640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37324800).
23015640 is an abundant number, since it is smaller than the sum of its proper divisors (51633960).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
23015640 is a wasteful number, since it uses less digits than its factorization.
23015640 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 337 (or 333 counting only the distinct ones).
The product of its (nonzero) digits is 720, while the sum is 21.
The square root of 23015640 is about 4797.4618289258. The cubic root of 23015640 is about 284.4511443644.
Adding to 23015640 its reverse (4651032), we get a palindrome (27666672).
The spelling of 23015640 in words is "twenty-three million, fifteen thousand, six hundred forty".
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