77911977 has 32 divisors (see below), whose sum is σ = 122806656. Its totient is φ = 43315200.

The previous prime is 77911957. The next prime is 77911979.

77911977 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 77911977 - 2¹⁰ = 77910953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77911979) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82327 + ... + 83267.

It is an arithmetic number, because the mean of its divisors is an integer number (3837708).

Almost surely, 2^77911977 is an apocalyptic number.

It is an amenable number.

77911977 is a deficient number, since it is larger than the sum of its proper divisors (44894679).

77911977 is a wasteful number, since it uses less digits than its factorization.

77911977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161.

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

The square root of 77911977 is about 8826.7761385457. The cubic root of 77911977 is about 427.1050844957.

The spelling of 77911977 in words is "seventy-seven million, nine hundred eleven thousand, nine hundred seventy-seven".