72774344 has 16 divisors (see below), whose sum is σ = 139780620. Its totient is φ = 35499520.

The previous prime is 72774319. The next prime is 72774349. The reversal of 72774344 is 44347727.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 48469444 + 24304900 = 6962^2 + 4930^2 .

It is a super-2 number, since 2×72774344² = 10592210289260672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72774298 and 72774307.

It is not an unprimeable number, because it can be changed into a prime (72774349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110609 + ... + 111264.

Almost surely, 2^72774344 is an apocalyptic number.

It is an amenable number.

72774344 is a deficient number, since it is larger than the sum of its proper divisors (67006276).

72774344 is a wasteful number, since it uses less digits than its factorization.

72774344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221920 (or 221916 counting only the distinct ones).

The product of its digits is 131712, while the sum is 38.

The square root of 72774344 is about 8530.7880058058. The cubic root of 72774344 is about 417.5028390929.

The spelling of 72774344 in words is "seventy-two million, seven hundred seventy-four thousand, three hundred forty-four".