72623637 has 18 divisors (see below), whose sum is σ = 107967158. Its totient is φ = 47006352.

The previous prime is 72623633. The next prime is 72623653. The reversal of 72623637 is 73632627.

It can be written as a sum of positive squares in only one way, i.e., 70660836 + 1962801 = 8406^2 + 1401^2 .

It is not a de Polignac number, because 72623637 - 2² = 72623633 is a prime.

It is a super-2 number, since 2×72623637² = 10548385302215538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72623633) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 155278 + ... + 155744.

Almost surely, 2^72623637 is an apocalyptic number.

It is an amenable number.

72623637 is a deficient number, since it is larger than the sum of its proper divisors (35343521).

72623637 is an equidigital number, since it uses as much as digits as its factorization.

72623637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977 (or 507 counting only the distinct ones).

The product of its digits is 63504, while the sum is 36.

The square root of 72623637 is about 8521.9503049478. The cubic root of 72623637 is about 417.2144403677.

The spelling of 72623637 in words is "seventy-two million, six hundred twenty-three thousand, six hundred thirty-seven".