80947845 has 48 divisors (see below), whose sum is σ = 158371200. Its totient is φ = 37887360.

The previous prime is 80947831. The next prime is 80947849. The reversal of 80947845 is 54874908.

It is not a de Polignac number, because 80947845 - 2⁹ = 80947333 is a prime.

It is a super-2 number, since 2×80947845² = 13105107220288050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 80947845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80947849) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11536 + ... + 17174.

It is an arithmetic number, because the mean of its divisors is an integer number (3299400).

Almost surely, 2^80947845 is an apocalyptic number.

It is an amenable number.

80947845 is a deficient number, since it is larger than the sum of its proper divisors (77423355).

80947845 is a wasteful number, since it uses less digits than its factorization.

80947845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5690 (or 5687 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 80947845 is about 8997.1020334328. The cubic root of 80947845 is about 432.5819863062.

The spelling of 80947845 in words is "eighty million, nine hundred forty-seven thousand, eight hundred forty-five".