Base | Representation |
---|---|
bin | 1111011111011… |
… | …1110010100000 |
3 | 11112021020011120 |
4 | 3313313302200 |
5 | 113113244310 |
6 | 10240412240 |
7 | 1416206316 |
oct | 367676240 |
9 | 145236146 |
10 | 64978080 |
11 | 33750aa2 |
12 | 19917080 |
13 | 10600a8b |
14 | 88b60b6 |
15 | 5a87b70 |
hex | 3df7ca0 |
64978080 has 96 divisors (see below), whose sum is σ = 216748224. Its totient is φ = 16306176.
The previous prime is 64978079. The next prime is 64978129. The reversal of 64978080 is 8087946.
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (96).
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4179 + ... + 12141.
It is an arithmetic number, because the mean of its divisors is an integer number (2257794).
Almost surely, 264978080 is an apocalyptic number.
64978080 is a gapful number since it is divisible by the number (60) 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 64978080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108374112).
64978080 is an abundant number, since it is smaller than the sum of its proper divisors (151770144).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
64978080 is a wasteful number, since it uses less digits than its factorization.
64978080 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7998 (or 7990 counting only the distinct ones).
The product of its (nonzero) digits is 96768, while the sum is 42.
The square root of 64978080 is about 8060.8982129785. The cubic root of 64978080 is about 402.0273736960.
The spelling of 64978080 in words is "sixty-four million, nine hundred seventy-eight thousand, eighty".
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