80915905 has 24 divisors (see below), whose sum is σ = 115371648. Its totient is φ = 54296928.

The previous prime is 80915897. The next prime is 80915911. The reversal of 80915905 is 50951908.

It is not a de Polignac number, because 80915905 - 2³ = 80915897 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8002 + ... + 15028.

It is an arithmetic number, because the mean of its divisors is an integer number (4807152).

Almost surely, 2^80915905 is an apocalyptic number.

It is an amenable number.

80915905 is a deficient number, since it is larger than the sum of its proper divisors (34455743).

80915905 is a wasteful number, since it uses less digits than its factorization.

80915905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7093 (or 7086 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 80915905 is about 8995.3268423110. The cubic root of 80915905 is about 432.5250834684.

The spelling of 80915905 in words is "eighty million, nine hundred fifteen thousand, nine hundred five".