64397685 has 16 divisors (see below), whose sum is σ = 112403520. Its totient is φ = 31223040.

The previous prime is 64397681. The next prime is 64397687. The reversal of 64397685 is 58679346.

It is not a de Polignac number, because 64397685 - 2² = 64397681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64397681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194980 + ... + 195309.

It is an arithmetic number, because the mean of its divisors is an integer number (7025220).

Almost surely, 2^64397685 is an apocalyptic number.

It is an amenable number.

64397685 is a deficient number, since it is larger than the sum of its proper divisors (48005835).

64397685 is a wasteful number, since it uses less digits than its factorization.

64397685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390308.

The product of its digits is 1088640, while the sum is 48.

The square root of 64397685 is about 8024.8168203393. The cubic root of 64397685 is about 400.8268002426.

The spelling of 64397685 in words is "sixty-four million, three hundred ninety-seven thousand, six hundred eighty-five".