64507660 has 48 divisors (see below), whose sum is σ = 162973440. Its totient is φ = 20952000.

The previous prime is 64507657. The next prime is 64507661. The reversal of 64507660 is 6670546.

64507660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64507660² = 8322476397351200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64507661) 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 15 ways as a sum of consecutive naturals, for example, 9466 + ... + 14785.

It is an arithmetic number, because the mean of its divisors is an integer number (3395280).

Almost surely, 2^64507660 is an apocalyptic number.

It is an amenable number.

64507660 is an abundant number, since it is smaller than the sum of its proper divisors (98465780).

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

64507660 is a wasteful number, since it uses less digits than its factorization.

64507660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24286 (or 24284 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 64507660 is about 8031.6660787162. Note that the first 3 decimals coincide. The cubic root of 64507660 is about 401.0548408318.

The spelling of 64507660 in words is "sixty-four million, five hundred seven thousand, six hundred sixty".