64694487 has 32 divisors (see below), whose sum is σ = 106686720. Its totient is φ = 34283520.

The previous prime is 64694477. The next prime is 64694491. The reversal of 64694487 is 78449646.

It is not a de Polignac number, because 64694487 - 2⁴ = 64694471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64694407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4183 + ... + 12119.

It is an arithmetic number, because the mean of its divisors is an integer number (3333960).

Almost surely, 2^64694487 is an apocalyptic number.

64694487 is a deficient number, since it is larger than the sum of its proper divisors (41992233).

64694487 is a wasteful number, since it uses less digits than its factorization.

64694487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7983.

The product of its digits is 1161216, while the sum is 48.

The square root of 64694487 is about 8043.2883200840. The cubic root of 64694487 is about 401.4416458179.

The spelling of 64694487 in words is "sixty-four million, six hundred ninety-four thousand, four hundred eighty-seven".