72977918 has 24 divisors (see below), whose sum is σ = 120244176. Its totient is φ = 33196800.

The previous prime is 72977911. The next prime is 72977921. The reversal of 72977918 is 81977927.

It is a super-2 number, since 2×72977918² = 10651553031229448, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72977911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22478 + ... + 25518.

It is an arithmetic number, because the mean of its divisors is an integer number (5010174).

Almost surely, 2^72977918 is an apocalyptic number.

72977918 is a deficient number, since it is larger than the sum of its proper divisors (47266258).

72977918 is a wasteful number, since it uses less digits than its factorization.

72977918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140 (or 3127 counting only the distinct ones).

The product of its digits is 444528, while the sum is 50.

The square root of 72977918 is about 8542.7113962723. The cubic root of 72977918 is about 417.8917746723.

Subtracting 72977918 from its reverse (81977927), we obtain a palindrome (9000009).

The spelling of 72977918 in words is "seventy-two million, nine hundred seventy-seven thousand, nine hundred eighteen".