85641880 has 32 divisors (see below), whose sum is σ = 201074400. Its totient is φ = 32766976.

The previous prime is 85641859. The next prime is 85641887. The reversal of 85641880 is 8814658.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85641887) 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, 45625 + ... + 47464.

It is an arithmetic number, because the mean of its divisors is an integer number (6283575).

Almost surely, 2^85641880 is an apocalyptic number.

It is an amenable number.

85641880 is an abundant number, since it is smaller than the sum of its proper divisors (115432520).

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

85641880 is a wasteful number, since it uses less digits than its factorization.

85641880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93123 (or 93119 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 85641880 is about 9254.2898160799. The cubic root of 85641880 is about 440.7869525553.

The spelling of 85641880 in words is "eighty-five million, six hundred forty-one thousand, eight hundred eighty".