74390644 has 6 divisors (see below), whose sum is σ = 130183634. Its totient is φ = 37195320.

The previous prime is 74390639. The next prime is 74390653. The reversal of 74390644 is 44609347.

It can be written as a sum of positive squares in only one way, i.e., 43164900 + 31225744 = 6570^2 + 5588^2 .

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, 9298827 + ... + 9298834.

Almost surely, 2^74390644 is an apocalyptic number.

It is an amenable number.

74390644 is a deficient number, since it is larger than the sum of its proper divisors (55792990).

74390644 is a wasteful number, since it uses less digits than its factorization.

74390644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18597665 (or 18597663 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 74390644 is about 8625.0011014492. The cubic root of 74390644 is about 420.5711126982.

The spelling of 74390644 in words is "seventy-four million, three hundred ninety thousand, six hundred forty-four".