80009865 has 24 divisors (see below), whose sum is σ = 149352840. Its totient is φ = 39389184.

The previous prime is 80009863. The next prime is 80009899. The reversal of 80009865 is 56890008.

It can be written as a sum of positive squares in 4 ways, for example, as 5308416 + 74701449 = 2304^2 + 8643^2 .

It is not a de Polignac number, because 80009865 - 2¹ = 80009863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80009863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67800 + ... + 68969.

It is an arithmetic number, because the mean of its divisors is an integer number (6223035).

Almost surely, 2^80009865 is an apocalyptic number.

It is an amenable number.

80009865 is a deficient number, since it is larger than the sum of its proper divisors (69342975).

80009865 is a wasteful number, since it uses less digits than its factorization.

80009865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136793 (or 136790 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 80009865 is about 8944.8233632644. The cubic root of 80009865 is about 430.9046485269.

The spelling of 80009865 in words is "eighty million, nine thousand, eight hundred sixty-five".