64861684 has 6 divisors (see below), whose sum is σ = 113507954. Its totient is φ = 32430840.

The previous prime is 64861651. The next prime is 64861697. The reversal of 64861684 is 48616846.

It can be written as a sum of positive squares in only one way, i.e., 41242084 + 23619600 = 6422^2 + 4860^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64861684.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8107707 + ... + 8107714.

Almost surely, 2^64861684 is an apocalyptic number.

It is an amenable number.

64861684 is a deficient number, since it is larger than the sum of its proper divisors (48646270).

64861684 is a wasteful number, since it uses less digits than its factorization.

64861684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16215425 (or 16215423 counting only the distinct ones).

The product of its digits is 221184, while the sum is 43.

The square root of 64861684 is about 8053.6751859012. The cubic root of 64861684 is about 401.7871780939.

The spelling of 64861684 in words is "sixty-four million, eight hundred sixty-one thousand, six hundred eighty-four".