85731580 has 48 divisors (see below), whose sum is σ = 204954624. Its totient is φ = 29817920.

The previous prime is 85731563. The next prime is 85731589. The reversal of 85731580 is 8513758.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85731589) 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, 3412 + ... + 13531.

It is an arithmetic number, because the mean of its divisors is an integer number (4269888).

Almost surely, 2^85731580 is an apocalyptic number.

It is an amenable number.

85731580 is an abundant number, since it is smaller than the sum of its proper divisors (119223044).

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

85731580 is a wasteful number, since it uses less digits than its factorization.

85731580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16986 (or 16984 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 85731580 is about 9259.1349487952. The cubic root of 85731580 is about 440.9407900378.

It can be divided in two parts, 857315 and 80, that added together give a triangular number (857395 = T₁₃₀₉).

The spelling of 85731580 in words is "eighty-five million, seven hundred thirty-one thousand, five hundred eighty".