72705739 has 2 divisors, whose sum is σ = 72705740. Its totient is φ = 72705738.

The previous prime is 72705727. The next prime is 72705769. The reversal of 72705739 is 93750727.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72705739 - 2⁵ = 72705707 is a prime.

It is a super-2 number, since 2×72705739² = 10572248967072242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72705769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36352869 + 36352870.

It is an arithmetic number, because the mean of its divisors is an integer number (36352870).

Almost surely, 2^72705739 is an apocalyptic number.

72705739 is a deficient number, since it is larger than the sum of its proper divisors (1).

72705739 is an equidigital number, since it uses as much as digits as its factorization.

72705739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92610, while the sum is 40.

The square root of 72705739 is about 8526.7660340835. The cubic root of 72705739 is about 417.3716033395.

The spelling of 72705739 in words is "seventy-two million, seven hundred five thousand, seven hundred thirty-nine".