80420865 has 16 divisors (see below), whose sum is σ = 147055488. Its totient is φ = 36763776.

The previous prime is 80420861. The next prime is 80420867. The reversal of 80420865 is 56802408.

It is not a de Polignac number, because 80420865 - 2² = 80420861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80420861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 382852 + ... + 383061.

It is an arithmetic number, because the mean of its divisors is an integer number (9190968).

Almost surely, 2^80420865 is an apocalyptic number.

It is an amenable number.

80420865 is a deficient number, since it is larger than the sum of its proper divisors (66634623).

80420865 is a wasteful number, since it uses less digits than its factorization.

80420865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765928.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 80420865 is about 8967.7681169843. The cubic root of 80420865 is about 431.6412219630.

The spelling of 80420865 in words is "eighty million, four hundred twenty thousand, eight hundred sixty-five".