72298991 has 4 divisors (see below), whose sum is σ = 72346584. Its totient is φ = 72251400.

The previous prime is 72298987. The next prime is 72299021. The reversal of 72298991 is 19989227.

It is a happy number.

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 72298991 - 2² = 72298987 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 (72298901) 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, 21440 + ... + 24581.

It is an arithmetic number, because the mean of its divisors is an integer number (18086646).

Almost surely, 2^72298991 is an apocalyptic number.

72298991 is a deficient number, since it is larger than the sum of its proper divisors (47593).

72298991 is a wasteful number, since it uses less digits than its factorization.

72298991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47592.

The product of its digits is 163296, while the sum is 47.

The square root of 72298991 is about 8502.8813351710. The cubic root of 72298991 is about 416.5918270563.

The spelling of 72298991 in words is "seventy-two million, two hundred ninety-eight thousand, nine hundred ninety-one".