87878778 has 32 divisors (see below), whose sum is σ = 191419200. Its totient is φ = 26733696.

The previous prime is 87878773. The next prime is 87878783. The reversal of 87878778 is 87787878.

It is an interprime number because it is at equal distance from previous prime (87878773) and next prime (87878783).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87878773) 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, 613 + ... + 13271.

It is an arithmetic number, because the mean of its divisors is an integer number (5981850).

Almost surely, 2^87878778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87878778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95709600).

87878778 is an abundant number, since it is smaller than the sum of its proper divisors (103540422).

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

87878778 is a wasteful number, since it uses less digits than its factorization.

87878778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12766.

The product of its digits is 9834496, while the sum is 60.

The square root of 87878778 is about 9374.3681387067. The cubic root of 87878778 is about 444.5916853861.

The spelling of 87878778 in words is "eighty-seven million, eight hundred seventy-eight thousand, seven hundred seventy-eight".