72697739 has 2 divisors, whose sum is σ = 72697740. Its totient is φ = 72697738.

The previous prime is 72697727. The next prime is 72697741. The reversal of 72697739 is 93779627.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72697739 is a prime.

It is a super-2 number, since 2×72697739² = 10569922511424242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 72697741, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72697789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36348869 + 36348870.

It is an arithmetic number, because the mean of its divisors is an integer number (36348870).

Almost surely, 2^72697739 is an apocalyptic number.

72697739 is a deficient number, since it is larger than the sum of its proper divisors (1).

72697739 is an equidigital number, since it uses as much as digits as its factorization.

72697739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1000188, while the sum is 50.

The square root of 72697739 is about 8526.2969101480. The cubic root of 72697739 is about 417.3562946199.

The spelling of 72697739 in words is "seventy-two million, six hundred ninety-seven thousand, seven hundred thirty-nine".