85891780 has 48 divisors (see below), whose sum is σ = 204482880. Its totient is φ = 30043008.

The previous prime is 85891759. The next prime is 85891781. The reversal of 85891780 is 8719858.

It is a self number, because there is not a number n which added to its sum of digits gives 85891780.

It is not an unprimeable number, because it can be changed into a prime (85891781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3754 + ... + 13633.

It is an arithmetic number, because the mean of its divisors is an integer number (4260060).

Almost surely, 2^85891780 is an apocalyptic number.

It is an amenable number.

85891780 is an abundant number, since it is smaller than the sum of its proper divisors (118591100).

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

85891780 is a wasteful number, since it uses less digits than its factorization.

85891780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17428 (or 17426 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 46.

The square root of 85891780 is about 9267.7818273846. The cubic root of 85891780 is about 441.2152698391.

The spelling of 85891780 in words is "eighty-five million, eight hundred ninety-one thousand, seven hundred eighty".