72431738 has 24 divisors (see below), whose sum is σ = 114457728. Its totient is φ = 34373592.

The previous prime is 72431729. The next prime is 72431753. The reversal of 72431738 is 83713427.

It is a junction number, because it is equal to n+sod(n) for n = 72431698 and 72431707.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235781 + ... + 236087.

It is an arithmetic number, because the mean of its divisors is an integer number (4769072).

Almost surely, 2^72431738 is an apocalyptic number.

72431738 is a deficient number, since it is larger than the sum of its proper divisors (42025990).

72431738 is a wasteful number, since it uses less digits than its factorization.

72431738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578 (or 555 counting only the distinct ones).

The product of its digits is 28224, while the sum is 35.

The square root of 72431738 is about 8510.6837563148. The cubic root of 72431738 is about 416.8466369922.

The spelling of 72431738 in words is "seventy-two million, four hundred thirty-one thousand, seven hundred thirty-eight".