87749894778 has 128 divisors (see below), whose sum is σ = 219106148352. Its totient is φ = 22812109056.

The previous prime is 87749894759. The next prime is 87749894779.

87749894778 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is not an unprimeable number, because it can be changed into a prime (87749894779) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12537576 + ... + 12544572.

It is an arithmetic number, because the mean of its divisors is an integer number (1711766784).

Almost surely, 2^87749894778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87749894778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109553074176).

87749894778 is an abundant number, since it is smaller than the sum of its proper divisors (131356253574).

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

87749894778 is a wasteful number, since it uses less digits than its factorization.

87749894778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7348.

The product of its digits is 1593188352, while the sum is 78.

The spelling of 87749894778 in words is "eighty-seven billion, seven hundred forty-nine million, eight hundred ninety-four thousand, seven hundred seventy-eight".