77955977 has 4 divisors (see below), whose sum is σ = 85042896. Its totient is φ = 70869060.

The previous prime is 77955961. The next prime is 77955991.

77955977 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77955977 - 2⁴ = 77955961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77955937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3543443 + ... + 3543464.

It is an arithmetic number, because the mean of its divisors is an integer number (21260724).

Almost surely, 2^77955977 is an apocalyptic number.

It is an amenable number.

77955977 is a deficient number, since it is larger than the sum of its proper divisors (7086919).

77955977 is a wasteful number, since it uses less digits than its factorization.

77955977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7086918.

The product of its digits is 4862025, while the sum is 56.

The square root of 77955977 is about 8829.2682029713. The cubic root of 77955977 is about 427.1854704557.

The spelling of 77955977 in words is "seventy-seven million, nine hundred fifty-five thousand, nine hundred seventy-seven".