72191982 has 16 divisors (see below), whose sum is σ = 151983360. Its totient is φ = 22797432.

The previous prime is 72191981. The next prime is 72191983. The reversal of 72191982 is 28919127.

It is an interprime number because it is at equal distance from previous prime (72191981) and next prime (72191983).

It is a self number, because there is not a number n which added to its sum of digits gives 72191982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72191981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316518 + ... + 316745.

It is an arithmetic number, because the mean of its divisors is an integer number (9498960).

Almost surely, 2^72191982 is an apocalyptic number.

72191982 is an abundant number, since it is smaller than the sum of its proper divisors (79791378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72191982 is a wasteful number, since it uses less digits than its factorization.

72191982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633287.

The product of its digits is 18144, while the sum is 39.

The square root of 72191982 is about 8496.5864910563. The cubic root of 72191982 is about 416.3861944650.

The spelling of 72191982 in words is "seventy-two million, one hundred ninety-one thousand, nine hundred eighty-two".