86641998 has 16 divisors (see below), whose sum is σ = 174349056. Its totient is φ = 28703160.

The previous prime is 86641991. The next prime is 86642011. The reversal of 86641998 is 89914668.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 86641998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86641991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43318 + ... + 45273.

It is an arithmetic number, because the mean of its divisors is an integer number (10896816).

Almost surely, 2^86641998 is an apocalyptic number.

86641998 is an abundant number, since it is smaller than the sum of its proper divisors (87707058).

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

86641998 is a wasteful number, since it uses less digits than its factorization.

86641998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88759.

The product of its digits is 746496, while the sum is 51.

The square root of 86641998 is about 9308.1683482842. The cubic root of 86641998 is about 442.4961396452.

The spelling of 86641998 in words is "eighty-six million, six hundred forty-one thousand, nine hundred ninety-eight".