77097891 has 8 divisors (see below), whose sum is σ = 110704720. Its totient is φ = 47444832.

The previous prime is 77097883. The next prime is 77097893. The reversal of 77097891 is 19879077.

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

It is not a de Polignac number, because 77097891 - 2³ = 77097883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77097891.

It is not an unprimeable number, because it can be changed into a prime (77097893) 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 7 ways as a sum of consecutive naturals, for example, 988396 + ... + 988473.

It is an arithmetic number, because the mean of its divisors is an integer number (13838090).

Almost surely, 2^77097891 is an apocalyptic number.

77097891 is a deficient number, since it is larger than the sum of its proper divisors (33606829).

77097891 is a wasteful number, since it uses less digits than its factorization.

77097891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1976885.

The product of its (nonzero) digits is 222264, while the sum is 48.

The square root of 77097891 is about 8780.5404731144. The cubic root of 77097891 is about 425.6122957604.

The spelling of 77097891 in words is "seventy-seven million, ninety-seven thousand, eight hundred ninety-one".