64406984 has 8 divisors (see below), whose sum is σ = 120763110. Its totient is φ = 32203488.

The previous prime is 64406981. The next prime is 64406989. The reversal of 64406984 is 48960446.

It can be written as a sum of positive squares in only one way, i.e., 33292900 + 31114084 = 5770^2 + 5578^2 .

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

It is not an unprimeable number, because it can be changed into a prime (64406981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4025429 + ... + 4025444.

Almost surely, 2^64406984 is an apocalyptic number.

It is an amenable number.

64406984 is a deficient number, since it is larger than the sum of its proper divisors (56356126).

64406984 is a wasteful number, since it uses less digits than its factorization.

64406984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8050879 (or 8050875 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 64406984 is about 8025.3961895971. The cubic root of 64406984 is about 400.8460923906.

The spelling of 64406984 in words is "sixty-four million, four hundred six thousand, nine hundred eighty-four".