72396644 has 18 divisors (see below), whose sum is σ = 131219634. Its totient is φ = 34948480.

The previous prime is 72396637. The next prime is 72396647. The reversal of 72396644 is 44669327.

It can be written as a sum of positive squares in 3 ways, for example, as 12334144 + 60062500 = 3512^2 + 7750^2 .

It is not an unprimeable number, because it can be changed into a prime (72396647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7397 + ... + 14124.

Almost surely, 2^72396644 is an apocalyptic number.

It is an amenable number.

72396644 is a deficient number, since it is larger than the sum of its proper divisors (58822990).

72396644 is a wasteful number, since it uses less digits than its factorization.

72396644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21583 (or 21552 counting only the distinct ones).

The product of its digits is 217728, while the sum is 41.

The square root of 72396644 is about 8508.6217450302. The cubic root of 72396644 is about 416.7793038059.

The spelling of 72396644 in words is "seventy-two million, three hundred ninety-six thousand, six hundred forty-four".