87761816778 has 32 divisors (see below), whose sum is σ = 180392414400. Its totient is φ = 28443571200.

The previous prime is 87761816777. The next prime is 87761816801.

87761816778 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (87761816777) 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, 185898 + ... + 458346.

It is an arithmetic number, because the mean of its divisors is an integer number (5637262950).

Almost surely, 2^87761816778 is an apocalyptic number.

87761816778 is an abundant number, since it is smaller than the sum of its proper divisors (92630597622).

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

87761816778 is a wasteful number, since it uses less digits than its factorization.

87761816778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273942.

The product of its digits is 44255232, while the sum is 66.

The spelling of 87761816778 in words is "eighty-seven billion, seven hundred sixty-one million, eight hundred sixteen thousand, seven hundred seventy-eight".