77121927 has 12 divisors (see below), whose sum is σ = 112250424. Its totient is φ = 51021360.

The previous prime is 77121923. The next prime is 77121929. The reversal of 77121927 is 72912177.

It is not a de Polignac number, because 77121927 - 2² = 77121923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77121891 and 77121900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77121923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31528 + ... + 33885.

It is an arithmetic number, because the mean of its divisors is an integer number (9354202).

Almost surely, 2^77121927 is an apocalyptic number.

77121927 is a deficient number, since it is larger than the sum of its proper divisors (35128497).

77121927 is a wasteful number, since it uses less digits than its factorization.

77121927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65550 (or 65547 counting only the distinct ones).

The product of its digits is 12348, while the sum is 36.

The square root of 77121927 is about 8781.9090749108. The cubic root of 77121927 is about 425.6565207238.

The spelling of 77121927 in words is "seventy-seven million, one hundred twenty-one thousand, nine hundred twenty-seven".