80979778 has 16 divisors (see below), whose sum is σ = 135333504. Its totient is φ = 36025360.

The previous prime is 80979763. The next prime is 80979799. The reversal of 80979778 is 87797908.

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 7 ways as a sum of consecutive naturals, for example, 38125 + ... + 40192.

It is an arithmetic number, because the mean of its divisors is an integer number (8458344).

Almost surely, 2^80979778 is an apocalyptic number.

80979778 is a deficient number, since it is larger than the sum of its proper divisors (54353726).

80979778 is a wasteful number, since it uses less digits than its factorization.

80979778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78377.

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 80979778 is about 8998.8764854286. The cubic root of 80979778 is about 432.6388617117.

The spelling of 80979778 in words is "eighty million, nine hundred seventy-nine thousand, seven hundred seventy-eight".