72751639 has 2 divisors, whose sum is σ = 72751640. Its totient is φ = 72751638.

The previous prime is 72751621. The next prime is 72751667. The reversal of 72751639 is 93615727.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72751639 - 2⁹ = 72751127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72751339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36375819 + 36375820.

It is an arithmetic number, because the mean of its divisors is an integer number (36375820).

Almost surely, 2^72751639 is an apocalyptic number.

72751639 is a deficient number, since it is larger than the sum of its proper divisors (1).

72751639 is an equidigital number, since it uses as much as digits as its factorization.

72751639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 40.

The square root of 72751639 is about 8529.4571339564. The cubic root of 72751639 is about 417.4594154198.

The spelling of 72751639 in words is "seventy-two million, seven hundred fifty-one thousand, six hundred thirty-nine".