80919972 has 108 divisors (see below), whose sum is σ = 246901200. Its totient is φ = 23106384.

The previous prime is 80919953. The next prime is 80919973. The reversal of 80919972 is 27991908.

It is a tau number, because it is divible by the number of its divisors (108).

It is not an unprimeable number, because it can be changed into a prime (80919973) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 46779 + ... + 48477.

Almost surely, 2^80919972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80919972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123450600).

80919972 is an abundant number, since it is smaller than the sum of its proper divisors (165981228).

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

80919972 is a wasteful number, since it uses less digits than its factorization.

80919972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732 (or 1711 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 80919972 is about 8995.5529012952. The cubic root of 80919972 is about 432.5323298808.

The spelling of 80919972 in words is "eighty million, nine hundred nineteen thousand, nine hundred seventy-two".