87851815878 has 32 divisors (see below), whose sum is σ = 175994956800. Its totient is φ = 29235427776.

The previous prime is 87851815847. The next prime is 87851815907.

87851815878 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10924183 + ... + 10932221.

It is an arithmetic number, because the mean of its divisors is an integer number (5499842400).

Almost surely, 2^87851815878 is an apocalyptic number.

87851815878 is an abundant number, since it is smaller than the sum of its proper divisors (88143140922).

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

87851815878 is a wasteful number, since it uses less digits than its factorization.

87851815878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10836.

The product of its digits is 40140800, while the sum is 66.

The spelling of 87851815878 in words is "eighty-seven billion, eight hundred fifty-one million, eight hundred fifteen thousand, eight hundred seventy-eight".