72866831 has 2 divisors, whose sum is σ = 72866832. Its totient is φ = 72866830.

The previous prime is 72866813. The next prime is 72866839. The reversal of 72866831 is 13866827.

It is a happy number.

Together with previous prime (72866813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72866831 - 2²⁶ = 5757967 is a prime.

It is a super-2 number, since 2×72866831² = 10619150119965122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72866839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36433415 + 36433416.

It is an arithmetic number, because the mean of its divisors is an integer number (36433416).

Almost surely, 2^72866831 is an apocalyptic number.

72866831 is a deficient number, since it is larger than the sum of its proper divisors (1).

72866831 is an equidigital number, since it uses as much as digits as its factorization.

72866831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 41.

The square root of 72866831 is about 8536.2070616873. The cubic root of 72866831 is about 417.6796286812.

The spelling of 72866831 in words is "seventy-two million, eight hundred sixty-six thousand, eight hundred thirty-one".