86427978 has 32 divisors (see below), whose sum is σ = 212747136. Its totient is φ = 22794048.

The previous prime is 86427977. The next prime is 86428003. The reversal of 86427978 is 87972468.

It is a self number, because there is not a number n which added to its sum of digits gives 86427978.

It is not an unprimeable number, because it can be changed into a prime (86427973) 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, 78601 + ... + 79692.

It is an arithmetic number, because the mean of its divisors is an integer number (6648348).

Almost surely, 2^86427978 is an apocalyptic number.

86427978 is an abundant number, since it is smaller than the sum of its proper divisors (126319158).

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

86427978 is a wasteful number, since it uses less digits than its factorization.

86427978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158318.

The product of its digits is 1354752, while the sum is 51.

The square root of 86427978 is about 9296.6648858610. The cubic root of 86427978 is about 442.1314931284.

The spelling of 86427978 in words is "eighty-six million, four hundred twenty-seven thousand, nine hundred seventy-eight".