80691772 has 24 divisors (see below), whose sum is σ = 165322080. Its totient is φ = 33738240.

The previous prime is 80691769. The next prime is 80691781. The reversal of 80691772 is 27719608.

It is a super-2 number, since 2×80691772² = 13022324136999968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33997 + ... + 36292.

It is an arithmetic number, because the mean of its divisors is an integer number (6888420).

Almost surely, 2^80691772 is an apocalyptic number.

80691772 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

80691772 is an abundant number, since it is smaller than the sum of its proper divisors (84630308).

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

80691772 is a wasteful number, since it uses less digits than its factorization.

80691772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70341 (or 70339 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 80691772 is about 8982.8599009447. The cubic root of 80691772 is about 432.1253565678.

The spelling of 80691772 in words is "eighty million, six hundred ninety-one thousand, seven hundred seventy-two".