87817071878 has 4 divisors (see below), whose sum is σ = 131725607820. Its totient is φ = 43908535938.

The previous prime is 87817071863. The next prime is 87817071883.

87817071878 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×87817071878² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87817071878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21954267968 + ... + 21954267971.

It is an arithmetic number, because the mean of its divisors is an integer number (32931401955).

Almost surely, 2^87817071878 is an apocalyptic number.

87817071878 is a deficient number, since it is larger than the sum of its proper divisors (43908535942).

87817071878 is a wasteful number, since it uses less digits than its factorization.

87817071878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43908535941.

The product of its (nonzero) digits is 9834496, while the sum is 62.

The spelling of 87817071878 in words is "eighty-seven billion, eight hundred seventeen million, seventy-one thousand, eight hundred seventy-eight".