80612905 has 4 divisors (see below), whose sum is σ = 96735492. Its totient is φ = 64490320.

The previous prime is 80612891. The next prime is 80612923. The reversal of 80612905 is 50921608.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52533504 + 28079401 = 7248^2 + 5299^2 .

It is not a de Polignac number, because 80612905 - 2¹⁷ = 80481833 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8061286 + ... + 8061295.

It is an arithmetic number, because the mean of its divisors is an integer number (24183873).

Almost surely, 2^80612905 is an apocalyptic number.

It is an amenable number.

80612905 is a deficient number, since it is larger than the sum of its proper divisors (16122587).

80612905 is a wasteful number, since it uses less digits than its factorization.

80612905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16122586.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 80612905 is about 8978.4689674799. The cubic root of 80612905 is about 431.9845262662.

The spelling of 80612905 in words is "eighty million, six hundred twelve thousand, nine hundred five".