80929865 has 16 divisors (see below), whose sum is σ = 100774800. Its totient is φ = 62318592.

The previous prime is 80929853. The next prime is 80929879. The reversal of 80929865 is 56892908.

It can be written as a sum of positive squares in 8 ways, for example, as 1024144 + 79905721 = 1012^2 + 8939^2 .

It is a cyclic number.

It is not a de Polignac number, because 80929865 - 2⁸ = 80929609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62141 + ... + 63429.

It is an arithmetic number, because the mean of its divisors is an integer number (6298425).

Almost surely, 2^80929865 is an apocalyptic number.

It is an amenable number.

80929865 is a deficient number, since it is larger than the sum of its proper divisors (19844935).

80929865 is a wasteful number, since it uses less digits than its factorization.

80929865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 80929865 is about 8996.1027673099. The cubic root of 80929865 is about 432.5499558054.

The spelling of 80929865 in words is "eighty million, nine hundred twenty-nine thousand, eight hundred sixty-five".