87956681778 has 36 divisors (see below), whose sum is σ = 221686740990. Its totient is φ = 25130480256.

The previous prime is 87956681759. The next prime is 87956681789. The reversal of 87956681778 is 87718665978.

It can be written as a sum of positive squares in only one way, i.e., 76409674929 + 11547006849 = 276423^2 + 107457^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 49861183 + ... + 49862946.

Almost surely, 2^87956681778 is an apocalyptic number.

87956681778 is an abundant number, since it is smaller than the sum of its proper divisors (133730059212).

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

87956681778 is a wasteful number, since it uses less digits than its factorization.

87956681778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99724151 (or 99724141 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 72.

The spelling of 87956681778 in words is "eighty-seven billion, nine hundred fifty-six million, six hundred eighty-one thousand, seven hundred seventy-eight".