72991459 has 4 divisors (see below), whose sum is σ = 73991416. Its totient is φ = 71991504.

The previous prime is 72991447. The next prime is 72991493. The reversal of 72991459 is 95419927.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72991459 - 2⁵ = 72991427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72991159) 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 in 3 ways as a sum of consecutive naturals, for example, 499869 + ... + 500014.

It is an arithmetic number, because the mean of its divisors is an integer number (18497854).

Almost surely, 2^72991459 is an apocalyptic number.

72991459 is a deficient number, since it is larger than the sum of its proper divisors (999957).

72991459 is an equidigital number, since it uses as much as digits as its factorization.

72991459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999956.

The product of its digits is 204120, while the sum is 46.

The square root of 72991459 is about 8543.5039064777. The cubic root of 72991459 is about 417.9176195795.

The spelling of 72991459 in words is "seventy-two million, nine hundred ninety-one thousand, four hundred fifty-nine".