87977877978 has 8 divisors (see below), whose sum is σ = 175955755968. Its totient is φ = 29325959324.

The previous prime is 87977877937. The next prime is 87977877983.

87977877978 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

87977877978 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 87977877978.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7331489826 + ... + 7331489837.

It is an arithmetic number, because the mean of its divisors is an integer number (21994469496).

Almost surely, 2^87977877978 is an apocalyptic number.

87977877978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

87977877978 is a wasteful number, since it uses less digits than its factorization.

87977877978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14662979668.

The product of its digits is 4879139328, while the sum is 84.

The spelling of 87977877978 in words is "eighty-seven billion, nine hundred seventy-seven million, eight hundred seventy-seven thousand, nine hundred seventy-eight".