87815451878 has 32 divisors (see below), whose sum is σ = 164247816960. Its totient is φ = 34209329760.

The previous prime is 87815451869. The next prime is 87815451883.

87815451878 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87815451878.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1295825 + ... + 1361907.

It is an arithmetic number, because the mean of its divisors is an integer number (5132744280).

Almost surely, 2^87815451878 is an apocalyptic number.

87815451878 is a deficient number, since it is larger than the sum of its proper divisors (76432365082).

87815451878 is a wasteful number, since it uses less digits than its factorization.

87815451878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74732.

The product of its digits is 20070400, while the sum is 62.

The spelling of 87815451878 in words is "eighty-seven billion, eight hundred fifteen million, four hundred fifty-one thousand, eight hundred seventy-eight".