72921073 has 2 divisors, whose sum is σ = 72921074. Its totient is φ = 72921072.

The previous prime is 72921049. The next prime is 72921119. The reversal of 72921073 is 37012927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64112049 + 8809024 = 8007^2 + 2968^2 .

It is a cyclic number.

It is not a de Polignac number, because 72921073 - 2¹⁷ = 72790001 is a prime.

It is not a weakly prime, because it can be changed into another prime (72921973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36460536 + 36460537.

It is an arithmetic number, because the mean of its divisors is an integer number (36460537).

Almost surely, 2^72921073 is an apocalyptic number.

It is an amenable number.

72921073 is a deficient number, since it is larger than the sum of its proper divisors (1).

72921073 is an equidigital number, since it uses as much as digits as its factorization.

72921073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 72921073 is about 8539.3836428632. The cubic root of 72921073 is about 417.7832430820.

The spelling of 72921073 in words is "seventy-two million, nine hundred twenty-one thousand, seventy-three".