80721172 has 24 divisors (see below), whose sum is σ = 161663040. Its totient is φ = 34547520.

The previous prime is 80721167. The next prime is 80721209. The reversal of 80721172 is 27112708.

It is a super-3 number, since 3×80721172³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 80721172.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25704 + ... + 28672.

It is an arithmetic number, because the mean of its divisors is an integer number (6735960).

Almost surely, 2^80721172 is an apocalyptic number.

It is an amenable number.

80721172 is an abundant number, since it is smaller than the sum of its proper divisors (80941868).

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

80721172 is a wasteful number, since it uses less digits than its factorization.

80721172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951 (or 3949 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 80721172 is about 8984.4962017912. The cubic root of 80721172 is about 432.1778317357.

The spelling of 80721172 in words is "eighty million, seven hundred twenty-one thousand, one hundred seventy-two".