72781326 has 12 divisors (see below), whose sum is σ = 157692912. Its totient is φ = 24260436.

The previous prime is 72781309. The next prime is 72781337. The reversal of 72781326 is 62318727.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2021686 + ... + 2021721.

It is an arithmetic number, because the mean of its divisors is an integer number (13141076).

Almost surely, 2^72781326 is an apocalyptic number.

72781326 is an abundant number, since it is smaller than the sum of its proper divisors (84911586).

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

72781326 is a wasteful number, since it uses less digits than its factorization.

72781326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043415 (or 4043412 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 72781326 is about 8531.1972196170. The cubic root of 72781326 is about 417.5161904630.

The spelling of 72781326 in words is "seventy-two million, seven hundred eighty-one thousand, three hundred twenty-six".