72640147 has 2 divisors, whose sum is σ = 72640148. Its totient is φ = 72640146.

The previous prime is 72640111. The next prime is 72640181. The reversal of 72640147 is 74104627.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72640147 - 2⁷ = 72640019 is a prime.

It is not a weakly prime, because it can be changed into another prime (72640747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36320073 + 36320074.

It is an arithmetic number, because the mean of its divisors is an integer number (36320074).

Almost surely, 2^72640147 is an apocalyptic number.

72640147 is a deficient number, since it is larger than the sum of its proper divisors (1).

72640147 is an equidigital number, since it uses as much as digits as its factorization.

72640147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 72640147 is about 8522.9189248754. The cubic root of 72640147 is about 417.2460539891.

The spelling of 72640147 in words is "seventy-two million, six hundred forty thousand, one hundred forty-seven".