72738389 has 2 divisors, whose sum is σ = 72738390. Its totient is φ = 72738388.

The previous prime is 72738377. The next prime is 72738433. The reversal of 72738389 is 98383727.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63840100 + 8898289 = 7990^2 + 2983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72738389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72738319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36369194 + 36369195.

It is an arithmetic number, because the mean of its divisors is an integer number (36369195).

Almost surely, 2^72738389 is an apocalyptic number.

It is an amenable number.

72738389 is a deficient number, since it is larger than the sum of its proper divisors (1).

72738389 is an equidigital number, since it uses as much as digits as its factorization.

72738389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 47.

The square root of 72738389 is about 8528.6803785814. The cubic root of 72738389 is about 417.4340704097.

The spelling of 72738389 in words is "seventy-two million, seven hundred thirty-eight thousand, three hundred eighty-nine".