72999973 has 2 divisors, whose sum is σ = 72999974. Its totient is φ = 72999972.

The previous prime is 72999961. The next prime is 72999991. The reversal of 72999973 is 37999927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68260644 + 4739329 = 8262^2 + 2177^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72999973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72999923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36499986 + 36499987.

It is an arithmetic number, because the mean of its divisors is an integer number (36499987).

Almost surely, 2^72999973 is an apocalyptic number.

It is an amenable number.

72999973 is a deficient number, since it is larger than the sum of its proper divisors (1).

72999973 is an equidigital number, since it uses as much as digits as its factorization.

72999973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1928934, while the sum is 55.

The square root of 72999973 is about 8544.0021652619. The cubic root of 72999973 is about 417.9338681120.

The spelling of 72999973 in words is "seventy-two million, nine hundred ninety-nine thousand, nine hundred seventy-three".