77808189 has 16 divisors (see below), whose sum is σ = 107553600. Its totient is φ = 49975296.

The previous prime is 77808179. The next prime is 77808193. The reversal of 77808189 is 98180877.

It is not a de Polignac number, because 77808189 - 2⁷ = 77808061 is a prime.

It is a super-2 number, since 2×77808189² = 12108228550919442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77808179) 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, 66322 + ... + 67484.

It is an arithmetic number, because the mean of its divisors is an integer number (6722100).

Almost surely, 2^77808189 is an apocalyptic number.

It is an amenable number.

77808189 is a deficient number, since it is larger than the sum of its proper divisors (29745411).

77808189 is a wasteful number, since it uses less digits than its factorization.

77808189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1964.

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

The square root of 77808189 is about 8820.8950226153. The cubic root of 77808189 is about 426.9153486667.

The spelling of 77808189 in words is "seventy-seven million, eight hundred eight thousand, one hundred eighty-nine".