77797911 has 4 divisors (see below), whose sum is σ = 103730552. Its totient is φ = 51865272.

The previous prime is 77797897. The next prime is 77797919. The reversal of 77797911 is 11979777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11979777 = 3 ⋅3993259.

It is not a de Polignac number, because 77797911 - 2⁹ = 77797399 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 (77797919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12966316 + ... + 12966321.

It is an arithmetic number, because the mean of its divisors is an integer number (25932638).

Almost surely, 2^77797911 is an apocalyptic number.

77797911 is a deficient number, since it is larger than the sum of its proper divisors (25932641).

77797911 is a wasteful number, since it uses less digits than its factorization.

77797911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25932640.

The product of its digits is 194481, while the sum is 48.

The square root of 77797911 is about 8820.3124094331. The cubic root of 77797911 is about 426.8965501776.

The spelling of 77797911 in words is "seventy-seven million, seven hundred ninety-seven thousand, nine hundred eleven".