87776267778 has 24 divisors (see below), whose sum is σ = 190207075500. Its totient is φ = 29254884864.

The previous prime is 87776267753. The next prime is 87776267791.

87776267778 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 85870683369 + 1905584409 = 293037^2 + 43653^2 .

It is a super-2 number, since 2×87776267778² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181083 + ... + 456446.

Almost surely, 2^87776267778 is an apocalyptic number.

87776267778 is an abundant number, since it is smaller than the sum of its proper divisors (102430807722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87776267778 is a wasteful number, since it uses less digits than its factorization.

87776267778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645186 (or 645183 counting only the distinct ones).

The product of its digits is 542126592, while the sum is 72.

The spelling of 87776267778 in words is "eighty-seven billion, seven hundred seventy-six million, two hundred sixty-seven thousand, seven hundred seventy-eight".