80198778 has 16 divisors (see below), whose sum is σ = 174979296. Its totient is φ = 24302640.

The previous prime is 80198761. The next prime is 80198801. The reversal of 80198778 is 87789108.

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, 607501 + ... + 607632.

It is an arithmetic number, because the mean of its divisors is an integer number (10936206).

Almost surely, 2^80198778 is an apocalyptic number.

80198778 is an abundant number, since it is smaller than the sum of its proper divisors (94780518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80198778 is a wasteful number, since it uses less digits than its factorization.

80198778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215149.

The product of its (nonzero) digits is 225792, while the sum is 48.

The square root of 80198778 is about 8955.3770439887. The cubic root of 80198778 is about 431.2435213477.

The spelling of 80198778 in words is "eighty million, one hundred ninety-eight thousand, seven hundred seventy-eight".