72889657 has 2 divisors, whose sum is σ = 72889658. Its totient is φ = 72889656.

The previous prime is 72889651. The next prime is 72889669. The reversal of 72889657 is 75698827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52359696 + 20529961 = 7236^2 + 4531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72889657 is a prime.

It is not a weakly prime, because it can be changed into another prime (72889651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36444828 + 36444829.

It is an arithmetic number, because the mean of its divisors is an integer number (36444829).

Almost surely, 2^72889657 is an apocalyptic number.

It is an amenable number.

72889657 is a deficient number, since it is larger than the sum of its proper divisors (1).

72889657 is an equidigital number, since it uses as much as digits as its factorization.

72889657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 52.

The square root of 72889657 is about 8537.5439676759. The cubic root of 72889657 is about 417.7232377314.

The spelling of 72889657 in words is "seventy-two million, eight hundred eighty-nine thousand, six hundred fifty-seven".