72700091 has 2 divisors, whose sum is σ = 72700092. Its totient is φ = 72700090.

The previous prime is 72700087. The next prime is 72700123. The reversal of 72700091 is 19000727.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72700091 - 2² = 72700087 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72700091.

It is not a weakly prime, because it can be changed into another prime (72700081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36350045 + 36350046.

It is an arithmetic number, because the mean of its divisors is an integer number (36350046).

Almost surely, 2^72700091 is an apocalyptic number.

72700091 is a deficient number, since it is larger than the sum of its proper divisors (1).

72700091 is an equidigital number, since it uses as much as digits as its factorization.

72700091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 72700091 is about 8526.4348352638. The cubic root of 72700091 is about 417.3607955000.

The spelling of 72700091 in words is "seventy-two million, seven hundred thousand, ninety-one".