72978733 has 6 divisors (see below), whose sum is σ = 74566766. Its totient is φ = 71423832.

The previous prime is 72978727. The next prime is 72978749. The reversal of 72978733 is 33787927.

It can be written as a sum of positive squares in only one way, i.e., 37908649 + 35070084 = 6157^2 + 5922^2 .

It is not a de Polignac number, because 72978733 - 2²¹ = 70881581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72978713) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14310 + ... + 18727.

Almost surely, 2^72978733 is an apocalyptic number.

It is an amenable number.

72978733 is a deficient number, since it is larger than the sum of its proper divisors (1588033).

72978733 is an equidigital number, since it uses as much as digits as its factorization.

72978733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33131 (or 33084 counting only the distinct ones).

The product of its digits is 444528, while the sum is 46.

The square root of 72978733 is about 8542.7590976218. The cubic root of 72978733 is about 417.8933303051.

The spelling of 72978733 in words is "seventy-two million, nine hundred seventy-eight thousand, seven hundred thirty-three".