85998639 has 8 divisors (see below), whose sum is σ = 114860592. Its totient is φ = 57234560.

The previous prime is 85998623. The next prime is 85998641. The reversal of 85998639 is 93689958.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85998639 - 2⁴ = 85998623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85998139) 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, 22392 + ... + 25949.

It is an arithmetic number, because the mean of its divisors is an integer number (14357574).

Almost surely, 2^85998639 is an apocalyptic number.

85998639 is a deficient number, since it is larger than the sum of its proper divisors (28861953).

85998639 is a wasteful number, since it uses less digits than its factorization.

85998639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48937.

The product of its digits is 4199040, while the sum is 57.

The square root of 85998639 is about 9273.5451150032. The cubic root of 85998639 is about 441.3981677588.

The spelling of 85998639 in words is "eighty-five million, nine hundred ninety-eight thousand, six hundred thirty-nine".