72539778 has 16 divisors (see below), whose sum is σ = 145254816. Its totient is φ = 24150720.

The previous prime is 72539773. The next prime is 72539813. The reversal of 72539778 is 87793527.

It is not an unprimeable number, because it can be changed into a prime (72539773) 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, 1576 + ... + 12147.

It is an arithmetic number, because the mean of its divisors is an integer number (9078426).

Almost surely, 2^72539778 is an apocalyptic number.

72539778 is an abundant number, since it is smaller than the sum of its proper divisors (72715038).

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

72539778 is a wasteful number, since it uses less digits than its factorization.

72539778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14609.

The product of its digits is 740880, while the sum is 48.

The square root of 72539778 is about 8517.0287072429. The cubic root of 72539778 is about 417.0537917484.

The spelling of 72539778 in words is "seventy-two million, five hundred thirty-nine thousand, seven hundred seventy-eight".