64331444 has 6 divisors (see below), whose sum is σ = 112580034. Its totient is φ = 32165720.

The previous prime is 64331413. The next prime is 64331489. The reversal of 64331444 is 44413346.

It can be written as a sum of positive squares in only one way, i.e., 52852900 + 11478544 = 7270^2 + 3388^2 .

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, 8041427 + ... + 8041434.

It is an arithmetic number, because the mean of its divisors is an integer number (18763339).

Almost surely, 2^64331444 is an apocalyptic number.

It is an amenable number.

64331444 is a deficient number, since it is larger than the sum of its proper divisors (48248590).

64331444 is a wasteful number, since it uses less digits than its factorization.

64331444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16082865 (or 16082863 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

The square root of 64331444 is about 8020.6884991252. The cubic root of 64331444 is about 400.6893197467.

The spelling of 64331444 in words is "sixty-four million, three hundred thirty-one thousand, four hundred forty-four".