77988977 has 12 divisors (see below), whose sum is σ = 90237840. Its totient is φ = 67165560.

The previous prime is 77988961. The next prime is 77988991.

77988977 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 77988977 - 2⁴ = 77988961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77988907) 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, 14663 + ... + 19260.

It is an arithmetic number, because the mean of its divisors is an integer number (7519820).

Almost surely, 2^77988977 is an apocalyptic number.

It is an amenable number.

77988977 is a deficient number, since it is larger than the sum of its proper divisors (12248863).

77988977 is a wasteful number, since it uses less digits than its factorization.

77988977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33964 (or 33953 counting only the distinct ones).

The product of its digits is 12446784, while the sum is 62.

The square root of 77988977 is about 8831.1367897910. The cubic root of 77988977 is about 427.2457400777.

The spelling of 77988977 in words is "seventy-seven million, nine hundred eighty-eight thousand, nine hundred seventy-seven".