72990733 has 4 divisors (see below), whose sum is σ = 73036288. Its totient is φ = 72945180.

The previous prime is 72990727. The next prime is 72990791. The reversal of 72990733 is 33709927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72990733 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 (72990703) 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, 20283 + ... + 23608.

It is an arithmetic number, because the mean of its divisors is an integer number (18259072).

Almost surely, 2^72990733 is an apocalyptic number.

It is an amenable number.

72990733 is a deficient number, since it is larger than the sum of its proper divisors (45555).

72990733 is a wasteful number, since it uses less digits than its factorization.

72990733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45554.

The product of its (nonzero) digits is 71442, while the sum is 40.

The square root of 72990733 is about 8543.4614179500. The cubic root of 72990733 is about 417.9162339873.

The spelling of 72990733 in words is "seventy-two million, nine hundred ninety thousand, seven hundred thirty-three".