64451944 has 8 divisors (see below), whose sum is σ = 120847410. Its totient is φ = 32225968.

The previous prime is 64451927. The next prime is 64451953. The reversal of 64451944 is 44915446.

It can be written as a sum of positive squares in only one way, i.e., 44756100 + 19695844 = 6690^2 + 4438^2 .

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

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4028239 + ... + 4028254.

Almost surely, 2^64451944 is an apocalyptic number.

It is an amenable number.

64451944 is a deficient number, since it is larger than the sum of its proper divisors (56395466).

64451944 is a wasteful number, since it uses less digits than its factorization.

64451944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8056499 (or 8056495 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 64451944 is about 8028.1968087485. The cubic root of 64451944 is about 400.9393423631.

The spelling of 64451944 in words is "sixty-four million, four hundred fifty-one thousand, nine hundred forty-four".