85881000 has 64 divisors (see below), whose sum is σ = 267958080. Its totient is φ = 22900800.

The previous prime is 85880999. The next prime is 85881001. The reversal of 85881000 is 18858.

It is an interprime number because it is at equal distance from previous prime (85880999) and next prime (85881001).

It is a super-2 number, since 2×85881000² = 14751092322000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (85881001) 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, 11314 + ... + 17313.

It is an arithmetic number, because the mean of its divisors is an integer number (4186845).

Almost surely, 2^85881000 is an apocalyptic number.

It is an amenable number.

85881000 is an abundant number, since it is smaller than the sum of its proper divisors (182077080).

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

85881000 is a wasteful number, since it uses less digits than its factorization.

85881000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28651 (or 28637 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 85881000 is about 9267.2002244475. The cubic root of 85881000 is about 441.1968105655.

Adding to 85881000 its reverse (18858), we get a palindrome (85899858).

The spelling of 85881000 in words is "eighty-five million, eight hundred eighty-one thousand".