78480778 has 16 divisors (see below), whose sum is σ = 122006016. Its totient is φ = 37822320.

The previous prime is 78480769. The next prime is 78480781. The reversal of 78480778 is 87708487.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13900 + ... + 18712.

It is an arithmetic number, because the mean of its divisors is an integer number (7625376).

Almost surely, 2^78480778 is an apocalyptic number.

78480778 is a deficient number, since it is larger than the sum of its proper divisors (43525238).

78480778 is a wasteful number, since it uses less digits than its factorization.

78480778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5109.

The product of its (nonzero) digits is 702464, while the sum is 49.

The square root of 78480778 is about 8858.9377467053. The cubic root of 78480778 is about 428.1419340310.

The spelling of 78480778 in words is "seventy-eight million, four hundred eighty thousand, seven hundred seventy-eight".