87851215878 has 16 divisors (see below), whose sum is σ = 177408281856. Its totient is φ = 28999430280.

The previous prime is 87851215867. The next prime is 87851215889.

87851215878 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (87851215867) and next prime (87851215889).

It is a super-2 number, since 2×87851215878² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71076418 + ... + 71077653.

It is an arithmetic number, because the mean of its divisors is an integer number (11088017616).

Almost surely, 2^87851215878 is an apocalyptic number.

87851215878 is an abundant number, since it is smaller than the sum of its proper divisors (89557065978).

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

87851215878 is a wasteful number, since it uses less digits than its factorization.

87851215878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142154179.

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

The spelling of 87851215878 in words is "eighty-seven billion, eight hundred fifty-one million, two hundred fifteen thousand, eight hundred seventy-eight".