77987278977 has 16 divisors (see below), whose sum is σ = 105681508032. Its totient is φ = 51148843200.

The previous prime is 77987278973. The next prime is 77987278981.

77987278977 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (77987278973) and next prime (77987278981).

It is not a de Polignac number, because 77987278977 - 2² = 77987278973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77987278973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 772123 + ... + 867264.

It is an arithmetic number, because the mean of its divisors is an integer number (6605094252).

Almost surely, 2^77987278977 is an apocalyptic number.

It is an amenable number.

77987278977 is a deficient number, since it is larger than the sum of its proper divisors (27694229055).

77987278977 is a wasteful number, since it uses less digits than its factorization.

77987278977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639648.

The product of its digits is 1219784832, while the sum is 78.

The spelling of 77987278977 in words is "seventy-seven billion, nine hundred eighty-seven million, two hundred seventy-eight thousand, nine hundred seventy-seven".