72198891 has 16 divisors (see below), whose sum is σ = 107437600. Its totient is φ = 47918304.

The previous prime is 72198883. The next prime is 72198899. The reversal of 72198891 is 19889127.

It is an interprime number because it is at equal distance from previous prime (72198883) and next prime (72198899).

It is not a de Polignac number, because 72198891 - 2³ = 72198883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72198899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345 + ... + 12021.

It is an arithmetic number, because the mean of its divisors is an integer number (6714850).

Almost surely, 2^72198891 is an apocalyptic number.

72198891 is a deficient number, since it is larger than the sum of its proper divisors (35238709).

72198891 is a wasteful number, since it uses less digits than its factorization.

72198891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11915 (or 11909 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 72198891 is about 8496.9930563700. The cubic root of 72198891 is about 416.3994771979.

It can be divided in two parts, 7219 and 8891, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 72198891 in words is "seventy-two million, one hundred ninety-eight thousand, eight hundred ninety-one".