72224537 has 24 divisors (see below), whose sum is σ = 92082816. Its totient is φ = 55440000.

The previous prime is 72224533. The next prime is 72224543. The reversal of 72224537 is 73542227.

It is not a de Polignac number, because 72224537 - 2² = 72224533 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72224533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59537 + ... + 60737.

It is an arithmetic number, because the mean of its divisors is an integer number (3836784).

Almost surely, 2^72224537 is an apocalyptic number.

72224537 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

72224537 is a deficient number, since it is larger than the sum of its proper divisors (19858279).

72224537 is a wasteful number, since it uses less digits than its factorization.

72224537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301 (or 1290 counting only the distinct ones).

The product of its digits is 23520, while the sum is 32.

The square root of 72224537 is about 8498.5020444782. The cubic root of 72224537 is about 416.4487748933.

The spelling of 72224537 in words is "seventy-two million, two hundred twenty-four thousand, five hundred thirty-seven".