72747918 has 24 divisors (see below), whose sum is σ = 157784328. Its totient is φ = 24224112.

The previous prime is 72747911. The next prime is 72747937. The reversal of 72747918 is 81974727.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72747911) 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, 25521 + ... + 28227.

It is an arithmetic number, because the mean of its divisors is an integer number (6574347).

Almost surely, 2^72747918 is an apocalyptic number.

72747918 is an abundant number, since it is smaller than the sum of its proper divisors (85036410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72747918 is a wasteful number, since it uses less digits than its factorization.

72747918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208 (or 4205 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 72747918 is about 8529.2390047413. The cubic root of 72747918 is about 417.4522980866.

The spelling of 72747918 in words is "seventy-two million, seven hundred forty-seven thousand, nine hundred eighteen".