80997745 has 4 divisors (see below), whose sum is σ = 97197300. Its totient is φ = 64798192.

The previous prime is 80997689. The next prime is 80997751. The reversal of 80997745 is 54779908.

It is a happy number.

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 60855601 + 20142144 = 7801^2 + 4488^2 .

It is a cyclic number.

It is not a de Polignac number, because 80997745 - 2⁷ = 80997617 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8099770 + ... + 8099779.

It is an arithmetic number, because the mean of its divisors is an integer number (24299325).

Almost surely, 2^80997745 is an apocalyptic number.

It is an amenable number.

80997745 is a deficient number, since it is larger than the sum of its proper divisors (16199555).

80997745 is a wasteful number, since it uses less digits than its factorization.

80997745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16199554.

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 80997745 is about 8999.8747213503. The cubic root of 80997745 is about 432.6708559034.

The spelling of 80997745 in words is "eighty million, nine hundred ninety-seven thousand, seven hundred forty-five".