76720739 has 2 divisors, whose sum is σ = 76720740. Its totient is φ = 76720738.

The previous prime is 76720687. The next prime is 76720741. The reversal of 76720739 is 93702767.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 76720739 - 2²⁴ = 59943523 is a prime.

It is a super-3 number, since 3×76720739³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 76720741, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 76720696 and 76720705.

It is not a weakly prime, because it can be changed into another prime (76720769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38360369 + 38360370.

It is an arithmetic number, because the mean of its divisors is an integer number (38360370).

Almost surely, 2^76720739 is an apocalyptic number.

76720739 is a deficient number, since it is larger than the sum of its proper divisors (1).

76720739 is an equidigital number, since it uses as much as digits as its factorization.

76720739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111132, while the sum is 41.

The square root of 76720739 is about 8759.0375612849. The cubic root of 76720739 is about 424.9171492478.

The spelling of 76720739 in words is "seventy-six million, seven hundred twenty thousand, seven hundred thirty-nine".