72360991 has 4 divisors (see below), whose sum is σ = 72403272. Its totient is φ = 72318712.

The previous prime is 72360983. The next prime is 72361007. The reversal of 72360991 is 19906327.

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 72360991 - 2³ = 72360983 is a prime.

It is a super-2 number, since 2×72360991² = 10472226037004162, which contains 22 as substring.

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 72360991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72360901) 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, 18460 + ... + 22033.

It is an arithmetic number, because the mean of its divisors is an integer number (18100818).

Almost surely, 2^72360991 is an apocalyptic number.

72360991 is a deficient number, since it is larger than the sum of its proper divisors (42281).

72360991 is a wasteful number, since it uses less digits than its factorization.

72360991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42280.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 72360991 is about 8506.5263768474. The cubic root of 72360991 is about 416.7108758069.

It can be divided in two parts, 7236099 and 1, that added together give a square (7236100 = 2690²).

The spelling of 72360991 in words is "seventy-two million, three hundred sixty thousand, nine hundred ninety-one".