72398644 has 6 divisors (see below), whose sum is σ = 126697634. Its totient is φ = 36199320.

The previous prime is 72398621. The next prime is 72398657. The reversal of 72398644 is 44689327.

It can be written as a sum of positive squares in only one way, i.e., 53144100 + 19254544 = 7290^2 + 4388^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72398644.

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, 9049827 + ... + 9049834.

Almost surely, 2^72398644 is an apocalyptic number.

It is an amenable number.

72398644 is a deficient number, since it is larger than the sum of its proper divisors (54298990).

72398644 is a wasteful number, since it uses less digits than its factorization.

72398644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18099665 (or 18099663 counting only the distinct ones).

The product of its digits is 290304, while the sum is 43.

The square root of 72398644 is about 8508.7392720661. The cubic root of 72398644 is about 416.7831416953.

The spelling of 72398644 in words is "seventy-two million, three hundred ninety-eight thousand, six hundred forty-four".