77198889 has 16 divisors (see below), whose sum is σ = 105670400. Its totient is φ = 50104656.

The previous prime is 77198873. The next prime is 77198893. The reversal of 77198889 is 98889177.

It is not a de Polignac number, because 77198889 - 2⁴ = 77198873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77198839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48102 + ... + 49680.

It is an arithmetic number, because the mean of its divisors is an integer number (6604400).

Almost surely, 2^77198889 is an apocalyptic number.

It is an amenable number.

77198889 is a deficient number, since it is larger than the sum of its proper divisors (28471511).

77198889 is a wasteful number, since it uses less digits than its factorization.

77198889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004.

The product of its digits is 2032128, while the sum is 57.

The square root of 77198889 is about 8786.2898313224. The cubic root of 77198889 is about 425.7980649310.

It can be divided in two parts, 77198 and 889, that added together give a palindrome (78087).

The spelling of 77198889 in words is "seventy-seven million, one hundred ninety-eight thousand, eight hundred eighty-nine".