72738889 has 2 divisors, whose sum is σ = 72738890. Its totient is φ = 72738888.

The previous prime is 72738881. The next prime is 72738907. The reversal of 72738889 is 98883727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71318025 + 1420864 = 8445^2 + 1192^2 .

It is a cyclic number.

It is not a de Polignac number, because 72738889 - 2³ = 72738881 is a prime.

It is not a weakly prime, because it can be changed into another prime (72738881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36369444 + 36369445.

It is an arithmetic number, because the mean of its divisors is an integer number (36369445).

Almost surely, 2^72738889 is an apocalyptic number.

It is an amenable number.

72738889 is a deficient number, since it is larger than the sum of its proper divisors (1).

72738889 is an equidigital number, since it uses as much as digits as its factorization.

72738889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 52.

The square root of 72738889 is about 8528.7096913894. The cubic root of 72738889 is about 417.4350268810.

The spelling of 72738889 in words is "seventy-two million, seven hundred thirty-eight thousand, eight hundred eighty-nine".