64243976 has 8 divisors (see below), whose sum is σ = 120457470. Its totient is φ = 32121984.

The previous prime is 64243967. The next prime is 64243987. The reversal of 64243976 is 67934246.

It can be written as a sum of positive squares in only one way, i.e., 43903876 + 20340100 = 6626^2 + 4510^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4015241 + ... + 4015256.

Almost surely, 2^64243976 is an apocalyptic number.

It is an amenable number.

64243976 is a deficient number, since it is larger than the sum of its proper divisors (56213494).

64243976 is a wasteful number, since it uses less digits than its factorization.

64243976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8030503 (or 8030499 counting only the distinct ones).

The product of its digits is 217728, while the sum is 41.

The square root of 64243976 is about 8015.2339953366. The cubic root of 64243976 is about 400.5076388179.

The spelling of 64243976 in words is "sixty-four million, two hundred forty-three thousand, nine hundred seventy-six".