64640698 has 32 divisors (see below), whose sum is σ = 110419200. Its totient is φ = 28191744.

The previous prime is 64640687. The next prime is 64640713. The reversal of 64640698 is 89604646.

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, 29298 + ... + 31426.

It is an arithmetic number, because the mean of its divisors is an integer number (3450600).

Almost surely, 2^64640698 is an apocalyptic number.

64640698 is a deficient number, since it is larger than the sum of its proper divisors (45778502).

64640698 is a wasteful number, since it uses less digits than its factorization.

64640698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2214.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 64640698 is about 8039.9439052770. The cubic root of 64640698 is about 401.3303579639.

The spelling of 64640698 in words is "sixty-four million, six hundred forty thousand, six hundred ninety-eight".