72920903 has 4 divisors (see below), whose sum is σ = 79550088. Its totient is φ = 66291720.

The previous prime is 72920899. The next prime is 72920909. The reversal of 72920903 is 30902927.

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

It is not a de Polignac number, because 72920903 - 2² = 72920899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72920903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72920909) 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, 3314576 + ... + 3314597.

It is an arithmetic number, because the mean of its divisors is an integer number (19887522).

Almost surely, 2^72920903 is an apocalyptic number.

72920903 is a deficient number, since it is larger than the sum of its proper divisors (6629185).

72920903 is a wasteful number, since it uses less digits than its factorization.

72920903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6629184.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 72920903 is about 8539.3736889774. The cubic root of 72920903 is about 417.7829184241.

The spelling of 72920903 in words is "seventy-two million, nine hundred twenty thousand, nine hundred three".