72639361 has 2 divisors, whose sum is σ = 72639362. Its totient is φ = 72639360.

The previous prime is 72639311. The next prime is 72639367. The reversal of 72639361 is 16393627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58614336 + 14025025 = 7656^2 + 3745^2 .

It is a cyclic number.

It is not a de Polignac number, because 72639361 - 2¹⁹ = 72115073 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72639361.

It is not a weakly prime, because it can be changed into another prime (72639367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36319680 + 36319681.

It is an arithmetic number, because the mean of its divisors is an integer number (36319681).

Almost surely, 2^72639361 is an apocalyptic number.

It is an amenable number.

72639361 is a deficient number, since it is larger than the sum of its proper divisors (1).

72639361 is an equidigital number, since it uses as much as digits as its factorization.

72639361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 72639361 is about 8522.8728137876. The cubic root of 72639361 is about 417.2445490519.

The spelling of 72639361 in words is "seventy-two million, six hundred thirty-nine thousand, three hundred sixty-one".