77998198 has 16 divisors (see below), whose sum is σ = 122363136. Its totient is φ = 37218280.

The previous prime is 77998189. The next prime is 77998213. The reversal of 77998198 is 89189977.

It is a congruent number.

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, 21453 + ... + 24823.

It is an arithmetic number, because the mean of its divisors is an integer number (7647696).

Almost surely, 2^77998198 is an apocalyptic number.

77998198 is a deficient number, since it is larger than the sum of its proper divisors (44364938).

77998198 is a wasteful number, since it uses less digits than its factorization.

77998198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3899.

The product of its digits is 2286144, while the sum is 58.

The square root of 77998198 is about 8831.6588475778. The cubic root of 77998198 is about 427.2625778321.

The spelling of 77998198 in words is "seventy-seven million, nine hundred ninety-eight thousand, one hundred ninety-eight".