72997999 has 4 divisors (see below), whose sum is σ = 74778480. Its totient is φ = 71217520.

The previous prime is 72997997. The next prime is 72998059. The reversal of 72997999 is 99979927.

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 72997999 - 2¹ = 72997997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72997993) 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, 890179 + ... + 890260.

It is an arithmetic number, because the mean of its divisors is an integer number (18694620).

Almost surely, 2^72997999 is an apocalyptic number.

72997999 is a deficient number, since it is larger than the sum of its proper divisors (1780481).

72997999 is a wasteful number, since it uses less digits than its factorization.

72997999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780480.

The product of its digits is 5786802, while the sum is 61.

The square root of 72997999 is about 8543.8866448473. The cubic root of 72997999 is about 417.9301009467.

The spelling of 72997999 in words is "seventy-two million, nine hundred ninety-seven thousand, nine hundred ninety-nine".