72554644 has 6 divisors (see below), whose sum is σ = 126970634. Its totient is φ = 36277320.

The previous prime is 72554639. The next prime is 72554659. The reversal of 72554644 is 44645527.

It can be written as a sum of positive squares in only one way, i.e., 57577744 + 14976900 = 7588^2 + 3870^2 .

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, 9069327 + ... + 9069334.

Almost surely, 2^72554644 is an apocalyptic number.

It is an amenable number.

72554644 is a deficient number, since it is larger than the sum of its proper divisors (54415990).

72554644 is a wasteful number, since it uses less digits than its factorization.

72554644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18138665 (or 18138663 counting only the distinct ones).

The product of its digits is 134400, while the sum is 37.

The square root of 72554644 is about 8517.9013847309. The cubic root of 72554644 is about 417.0822795582.

The spelling of 72554644 in words is "seventy-two million, five hundred fifty-four thousand, six hundred forty-four".