72047999 has 4 divisors (see below), whose sum is σ = 74372160. Its totient is φ = 69723840.

The previous prime is 72047993. The next prime is 72048001. The reversal of 72047999 is 99974027.

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 72047999 - 2⁸ = 72047743 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 (72047993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1162034 + ... + 1162095.

It is an arithmetic number, because the mean of its divisors is an integer number (18593040).

Almost surely, 2^72047999 is an apocalyptic number.

72047999 is a deficient number, since it is larger than the sum of its proper divisors (2324161).

72047999 is a wasteful number, since it uses less digits than its factorization.

72047999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324160.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 72047999 is about 8488.1092712099. The cubic root of 72047999 is about 416.1091903187.

The spelling of 72047999 in words is "seventy-two million, forty-seven thousand, nine hundred ninety-nine".