86978556 has 96 divisors (see below), whose sum is σ = 260449280. Its totient is φ = 24587712.

The previous prime is 86978539. The next prime is 86978581. The reversal of 86978556 is 65587968.

86978556 is a `hidden beast` number, since 86 + 9 + 7 + 8 + 556 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77310 + ... + 78426.

Almost surely, 2^86978556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86978556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130224640).

86978556 is an abundant number, since it is smaller than the sum of its proper divisors (173470724).

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

86978556 is a wasteful number, since it uses less digits than its factorization.

86978556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240 (or 1232 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The square root of 86978556 is about 9326.2294631861. The cubic root of 86978556 is about 443.0683532831.

The spelling of 86978556 in words is "eighty-six million, nine hundred seventy-eight thousand, five hundred fifty-six".