87815251878 has 32 divisors (see below), whose sum is σ = 186204278400. Its totient is φ = 27531622656.

The previous prime is 87815251871. The next prime is 87815251949.

87815251878 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87815251871) 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, 2755051 + ... + 2786742.

It is an arithmetic number, because the mean of its divisors is an integer number (5818883700).

Almost surely, 2^87815251878 is an apocalyptic number.

87815251878 is an abundant number, since it is smaller than the sum of its proper divisors (98389026522).

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

87815251878 is a wasteful number, since it uses less digits than its factorization.

87815251878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5541956.

The product of its digits is 10035200, while the sum is 60.

The spelling of 87815251878 in words is "eighty-seven billion, eight hundred fifteen million, two hundred fifty-one thousand, eight hundred seventy-eight".