72907949 has 2 divisors, whose sum is σ = 72907950. Its totient is φ = 72907948.

The previous prime is 72907867. The next prime is 72907957. The reversal of 72907949 is 94970927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72675625 + 232324 = 8525^2 + 482^2 .

It is a cyclic number.

It is not a de Polignac number, because 72907949 - 2²⁰ = 71859373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72907969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36453974 + 36453975.

It is an arithmetic number, because the mean of its divisors is an integer number (36453975).

Almost surely, 2^72907949 is an apocalyptic number.

It is an amenable number.

72907949 is a deficient number, since it is larger than the sum of its proper divisors (1).

72907949 is an equidigital number, since it uses as much as digits as its factorization.

72907949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 72907949 is about 8538.6151687496. The cubic root of 72907949 is about 417.7581780081.

The spelling of 72907949 in words is "seventy-two million, nine hundred seven thousand, nine hundred forty-nine".