72636556 has 6 divisors (see below), whose sum is σ = 127113980. Its totient is φ = 36318276.

The previous prime is 72636547. The next prime is 72636559. The reversal of 72636556 is 65563627.

It is a super-2 number, since 2×72636556² = 10552138535082272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72636559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9079566 + ... + 9079573.

Almost surely, 2^72636556 is an apocalyptic number.

It is an amenable number.

72636556 is a deficient number, since it is larger than the sum of its proper divisors (54477424).

72636556 is a wasteful number, since it uses less digits than its factorization.

72636556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18159143 (or 18159141 counting only the distinct ones).

The product of its digits is 226800, while the sum is 40.

The square root of 72636556 is about 8522.7082550091. The cubic root of 72636556 is about 417.2391782905.

The spelling of 72636556 in words is "seventy-two million, six hundred thirty-six thousand, five hundred fifty-six".