72919687 has 2 divisors, whose sum is σ = 72919688. Its totient is φ = 72919686.

The previous prime is 72919661. The next prime is 72919703. The reversal of 72919687 is 78691927.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72919687 - 2¹⁹ = 72395399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72919687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72919087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36459843 + 36459844.

It is an arithmetic number, because the mean of its divisors is an integer number (36459844).

Almost surely, 2^72919687 is an apocalyptic number.

72919687 is a deficient number, since it is larger than the sum of its proper divisors (1).

72919687 is an equidigital number, since it uses as much as digits as its factorization.

72919687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 49.

The square root of 72919687 is about 8539.3024890795. The cubic root of 72919687 is about 417.7805961506.

The spelling of 72919687 in words is "seventy-two million, nine hundred nineteen thousand, six hundred eighty-seven".