64520628 has 12 divisors (see below), whose sum is σ = 150548160. Its totient is φ = 21506872.

The previous prime is 64520623. The next prime is 64520629. The reversal of 64520628 is 82602546.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×64520628² = 8325822875028768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64520623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2688348 + ... + 2688371.

It is an arithmetic number, because the mean of its divisors is an integer number (12545680).

Almost surely, 2^64520628 is an apocalyptic number.

It is an amenable number.

64520628 is an abundant number, since it is smaller than the sum of its proper divisors (86027532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64520628 is a wasteful number, since it uses less digits than its factorization.

64520628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5376726 (or 5376724 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 64520628 is about 8032.4733426262. The cubic root of 64520628 is about 401.0817137681.

The spelling of 64520628 in words is "sixty-four million, five hundred twenty thousand, six hundred twenty-eight".