72990207889 has 3 divisors (see below), whose sum is σ = 72990478057. Its totient is φ = 72989937722.

The previous prime is 72990207881. The next prime is 72990207949. The reversal of 72990207889 is 98870209927.

The square root of 72990207889 is 270167.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 72990207889 - 2³ = 72990207881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72990207881) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 135084 + ... + 405250.

Almost surely, 2^72990207889 is an apocalyptic number.

72990207889 is the 270167-th square number.

72990207889 is the 135084-th centered octagonal number.

It is an amenable number.

72990207889 is a deficient number, since it is larger than the sum of its proper divisors (270168).

72990207889 is an frugal number, since it uses more digits than its factorization.

72990207889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540334 (or 270167 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 61.

The spelling of 72990207889 in words is "seventy-two billion, nine hundred ninety million, two hundred seven thousand, eight hundred eighty-nine".