72776731 has 2 divisors, whose sum is σ = 72776732. Its totient is φ = 72776730.

The previous prime is 72776701. The next prime is 72776741. The reversal of 72776731 is 13767727.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72776731 - 2⁵ = 72776699 is a prime.

It is a super-2 number, since 2×72776731² = 10592905150092722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72776701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36388365 + 36388366.

It is an arithmetic number, because the mean of its divisors is an integer number (36388366).

Almost surely, 2^72776731 is an apocalyptic number.

72776731 is a deficient number, since it is larger than the sum of its proper divisors (1).

72776731 is an equidigital number, since it uses as much as digits as its factorization.

72776731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86436, while the sum is 40.

The square root of 72776731 is about 8530.9279096708. The cubic root of 72776731 is about 417.5074037436.

The spelling of 72776731 in words is "seventy-two million, seven hundred seventy-six thousand, seven hundred thirty-one".