77973189 has 16 divisors (see below), whose sum is σ = 120766080. Its totient is φ = 43824960.

The previous prime is 77973179. The next prime is 77973211. The reversal of 77973189 is 98137977.

It is a happy number.

It is not a de Polignac number, because 77973189 - 2⁴ = 77973173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77973109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29154 + ... + 31715.

It is an arithmetic number, because the mean of its divisors is an integer number (7547880).

Almost surely, 2^77973189 is an apocalyptic number.

It is an amenable number.

77973189 is a deficient number, since it is larger than the sum of its proper divisors (42792891).

77973189 is a wasteful number, since it uses less digits than its factorization.

77973189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60940.

The product of its digits is 666792, while the sum is 51.

The square root of 77973189 is about 8830.2428618923. The cubic root of 77973189 is about 427.2169077511.

The spelling of 77973189 in words is "seventy-seven million, nine hundred seventy-three thousand, one hundred eighty-nine".