72599999 has 4 divisors (see below), whose sum is σ = 73130064. Its totient is φ = 72069936.

The previous prime is 72599987. The next prime is 72600001. The reversal of 72599999 is 99999527.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72599999 is a prime.

It is a Duffinian number.

72599999 is a modest number, since divided by 9999 gives 7259 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72599939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264827 + ... + 265100.

It is an arithmetic number, because the mean of its divisors is an integer number (18282516).

Almost surely, 2^72599999 is an apocalyptic number.

72599999 is a deficient number, since it is larger than the sum of its proper divisors (530065).

72599999 is a wasteful number, since it uses less digits than its factorization.

72599999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530064.

The product of its digits is 4133430, while the sum is 59.

The square root of 72599999 is about 8520.5633029748. The cubic root of 72599999 is about 417.1691695921.

The spelling of 72599999 in words is "seventy-two million, five hundred ninety-nine thousand, nine hundred ninety-nine".