64640694 has 16 divisors (see below), whose sum is σ = 129896640. Its totient is φ = 21444360.

The previous prime is 64640687. The next prime is 64640713. The reversal of 64640694 is 49604646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24264 + ... + 26795.

It is an arithmetic number, because the mean of its divisors is an integer number (8118540).

Almost surely, 2^64640694 is an apocalyptic number.

64640694 is an abundant number, since it is smaller than the sum of its proper divisors (65255946).

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

64640694 is a wasteful number, since it uses less digits than its factorization.

64640694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51275.

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 64640694 is about 8039.9436565190. The cubic root of 64640694 is about 401.3303496858.

The spelling of 64640694 in words is "sixty-four million, six hundred forty thousand, six hundred ninety-four".