80691773 has 4 divisors (see below), whose sum is σ = 80841468. Its totient is φ = 80542080.

The previous prime is 80691769. The next prime is 80691781. The reversal of 80691773 is 37719608.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17123044 + 63568729 = 4138^2 + 7973^2 .

It is a cyclic number.

It is not a de Polignac number, because 80691773 - 2² = 80691769 is a prime.

It is a super-2 number, since 2×80691773² = 13022324459767058, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80691773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80691703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74036 + ... + 75117.

It is an arithmetic number, because the mean of its divisors is an integer number (20210367).

Almost surely, 2^80691773 is an apocalyptic number.

It is an amenable number.

80691773 is a deficient number, since it is larger than the sum of its proper divisors (149695).

80691773 is a wasteful number, since it uses less digits than its factorization.

80691773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149694.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 80691773 is about 8982.8599566062. The cubic root of 80691773 is about 432.1253583529.

The spelling of 80691773 in words is "eighty million, six hundred ninety-one thousand, seven hundred seventy-three".