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7628381 = 74310267
BaseRepresentation
bin11101000110011001011101
3112100120011122
4131012121131
53423102011
6431300325
7121561115
oct35063135
915316148
107628381
114340352
12267a6a5
131771247
141028045
15a0a3db
hex74665d

7628381 has 4 divisors (see below), whose sum is σ = 7639392. Its totient is φ = 7617372.

The previous prime is 7628377. The next prime is 7628389. The reversal of 7628381 is 1838267.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1838267 = 9671901.

It is a cyclic number.

It is not a de Polignac number, because 7628381 - 22 = 7628377 is a prime.

It is a super-2 number, since 2×76283812 = 116384393362322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7628389) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4391 + ... + 5876.

It is an arithmetic number, because the mean of its divisors is an integer number (1909848).

Almost surely, 27628381 is an apocalyptic number.

It is an amenable number.

7628381 is a deficient number, since it is larger than the sum of its proper divisors (11011).

7628381 is a wasteful number, since it uses less digits than its factorization.

7628381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010.

The product of its digits is 16128, while the sum is 35.

The square root of 7628381 is about 2761.9523891624. The cubic root of 7628381 is about 196.8539462159.

The spelling of 7628381 in words is "seven million, six hundred twenty-eight thousand, three hundred eighty-one".

Divisors: 1 743 10267 7628381