77916189 has 8 divisors (see below), whose sum is σ = 111879712. Its totient is φ = 47948400.

The previous prime is 77916187. The next prime is 77916211. The reversal of 77916189 is 98161977.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77916189 - 2¹ = 77916187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77916187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998887 + ... + 998964.

It is an arithmetic number, because the mean of its divisors is an integer number (13984964).

Almost surely, 2^77916189 is an apocalyptic number.

It is an amenable number.

77916189 is a deficient number, since it is larger than the sum of its proper divisors (33963523).

77916189 is a wasteful number, since it uses less digits than its factorization.

77916189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997867.

The product of its digits is 190512, while the sum is 48.

The square root of 77916189 is about 8827.0147275282. The cubic root of 77916189 is about 427.1127809342.

The spelling of 77916189 in words is "seventy-seven million, nine hundred sixteen thousand, one hundred eighty-nine".