72437731 has 8 divisors (see below), whose sum is σ = 79173504. Its totient is φ = 65976960.

The previous prime is 72437713. The next prime is 72437779. The reversal of 72437731 is 13773427.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72437731 - 2⁹ = 72437219 is a prime.

It is a super-2 number, since 2×72437731² = 10494449744856722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72437831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68200 + ... + 69253.

It is an arithmetic number, because the mean of its divisors is an integer number (9896688).

Almost surely, 2^72437731 is an apocalyptic number.

72437731 is a deficient number, since it is larger than the sum of its proper divisors (6735773).

72437731 is a wasteful number, since it uses less digits than its factorization.

72437731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137501.

The product of its digits is 24696, while the sum is 34.

The square root of 72437731 is about 8511.0358359015. The cubic root of 72437731 is about 416.8581333016.

The spelling of 72437731 in words is "seventy-two million, four hundred thirty-seven thousand, seven hundred thirty-one".