73136639 has 2 divisors, whose sum is σ = 73136640. Its totient is φ = 73136638.

The previous prime is 73136627. The next prime is 73136647. The reversal of 73136639 is 93663137.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 73136639 - 2²⁴ = 56359423 is a prime.

It is a Sophie Germain 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 (73136659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36568319 + 36568320.

It is an arithmetic number, because the mean of its divisors is an integer number (36568320).

Almost surely, 2^73136639 is an apocalyptic number.

73136639 is a deficient number, since it is larger than the sum of its proper divisors (1).

73136639 is an equidigital number, since it uses as much as digits as its factorization.

73136639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 38.

The square root of 73136639 is about 8551.9961997185. The cubic root of 73136639 is about 418.1945154376.

The spelling of 73136639 in words is "seventy-three million, one hundred thirty-six thousand, six hundred thirty-nine".