72987923 has 2 divisors, whose sum is σ = 72987924. Its totient is φ = 72987922.

The previous prime is 72987917. The next prime is 72987961. The reversal of 72987923 is 32978927.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72987923 - 2⁴ = 72987907 is a prime.

It is not a weakly prime, because it can be changed into another prime (72987973) 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, 36493961 + 36493962.

It is an arithmetic number, because the mean of its divisors is an integer number (36493962).

Almost surely, 2^72987923 is an apocalyptic number.

72987923 is a deficient number, since it is larger than the sum of its proper divisors (1).

72987923 is an equidigital number, since it uses as much as digits as its factorization.

72987923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 72987923 is about 8543.2969631168. The cubic root of 72987923 is about 417.9108709335.

The spelling of 72987923 in words is "seventy-two million, nine hundred eighty-seven thousand, nine hundred twenty-three".