85111580 has 12 divisors (see below), whose sum is σ = 178734360. Its totient is φ = 34044624.

The previous prime is 85111561. The next prime is 85111597. The reversal of 85111580 is 8511158.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2127770 + ... + 2127809.

It is an arithmetic number, because the mean of its divisors is an integer number (14894530).

Almost surely, 2^85111580 is an apocalyptic number.

It is an amenable number.

85111580 is an abundant number, since it is smaller than the sum of its proper divisors (93622780).

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

85111580 is a wasteful number, since it uses less digits than its factorization.

85111580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255588 (or 4255586 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 29.

The square root of 85111580 is about 9225.5937478300. The cubic root of 85111580 is about 439.8752745652.

It can be divided in two parts, 851 and 11580, that multiplied together give a triangular number (9854580 = T₄₄₃₉).

The spelling of 85111580 in words is "eighty-five million, one hundred eleven thousand, five hundred eighty".