80815779 has 48 divisors (see below), whose sum is σ = 136298400. Its totient is φ = 47234880.

The previous prime is 80815771. The next prime is 80815783. The reversal of 80815779 is 97751808.

It is not a de Polignac number, because 80815779 - 2³ = 80815771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80815771) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 94317 + ... + 95169.

It is an arithmetic number, because the mean of its divisors is an integer number (2839550).

Almost surely, 2^80815779 is an apocalyptic number.

80815779 is a deficient number, since it is larger than the sum of its proper divisors (55482621).

80815779 is a wasteful number, since it uses less digits than its factorization.

80815779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913 (or 896 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 80815779 is about 8989.7596742071. The cubic root of 80815779 is about 432.3466064780.

The spelling of 80815779 in words is "eighty million, eight hundred fifteen thousand, seven hundred seventy-nine".