64904144 has 10 divisors (see below), whose sum is σ = 125751810. Its totient is φ = 32452064.

The previous prime is 64904131. The next prime is 64904207. The reversal of 64904144 is 44140946.

It can be written as a sum of positive squares in only one way, i.e., 49000000 + 15904144 = 7000^2 + 3988^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64904144.

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, 2028239 + ... + 2028270.

It is an arithmetic number, because the mean of its divisors is an integer number (12575181).

Almost surely, 2^64904144 is an apocalyptic number.

It is an amenable number.

64904144 is a deficient number, since it is larger than the sum of its proper divisors (60847666).

64904144 is a wasteful number, since it uses less digits than its factorization.

64904144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056517 (or 4056511 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 64904144 is about 8056.3108182344. The cubic root of 64904144 is about 401.8748321155.

The spelling of 64904144 in words is "sixty-four million, nine hundred four thousand, one hundred forty-four".