72356891 has 2 divisors, whose sum is σ = 72356892. Its totient is φ = 72356890.

The previous prime is 72356887. The next prime is 72356897. The reversal of 72356891 is 19865327.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72356891 - 2² = 72356887 is a prime.

It is not a weakly prime, because it can be changed into another prime (72356897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36178445 + 36178446.

It is an arithmetic number, because the mean of its divisors is an integer number (36178446).

Almost surely, 2^72356891 is an apocalyptic number.

72356891 is a deficient number, since it is larger than the sum of its proper divisors (1).

72356891 is an equidigital number, since it uses as much as digits as its factorization.

72356891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 72356891 is about 8506.2853819984. The cubic root of 72356891 is about 416.7030053285.

The spelling of 72356891 in words is "seventy-two million, three hundred fifty-six thousand, eight hundred ninety-one".