72911999 has 2 divisors, whose sum is σ = 72912000. Its totient is φ = 72911998.

The previous prime is 72911989. The next prime is 72912029. The reversal of 72911999 is 99911927.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72911999 - 2⁴ = 72911983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72911939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36455999 + 36456000.

It is an arithmetic number, because the mean of its divisors is an integer number (36456000).

Almost surely, 2^72911999 is an apocalyptic number.

72911999 is a deficient number, since it is larger than the sum of its proper divisors (1).

72911999 is an equidigital number, since it uses as much as digits as its factorization.

72911999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91854, while the sum is 47.

The square root of 72911999 is about 8538.8523233512. The cubic root of 72911999 is about 417.7659132840.

The spelling of 72911999 in words is "seventy-two million, nine hundred eleven thousand, nine hundred ninety-nine".