72688739 has 2 divisors, whose sum is σ = 72688740. Its totient is φ = 72688738.

The previous prime is 72688691. The next prime is 72688741. The reversal of 72688739 is 93788627.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (93788627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72688739 - 2²⁴ = 55911523 is a prime.

Together with 72688741, 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 (72688139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36344369 + 36344370.

It is an arithmetic number, because the mean of its divisors is an integer number (36344370).

Almost surely, 2^72688739 is an apocalyptic number.

72688739 is a deficient number, since it is larger than the sum of its proper divisors (1).

72688739 is an equidigital number, since it uses as much as digits as its factorization.

72688739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The square root of 72688739 is about 8525.7691148658. The cubic root of 72688739 is about 417.3390709680.

The spelling of 72688739 in words is "seventy-two million, six hundred eighty-eight thousand, seven hundred thirty-nine".