85191880 has 16 divisors (see below), whose sum is σ = 191681820. Its totient is φ = 34076736.

The previous prime is 85191863. The next prime is 85191889. The reversal of 85191880 is 8819158.

It can be written as a sum of positive squares in 2 ways, for example, as 83649316 + 1542564 = 9146^2 + 1242^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 2129797 = 85191880 / (8 + 5 + 1 + 9 + 1 + 8 + 8 + 0).

It is not an unprimeable number, because it can be changed into a prime (85191889) 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 3 ways as a sum of consecutive naturals, for example, 1064859 + ... + 1064938.

Almost surely, 2^85191880 is an apocalyptic number.

It is an amenable number.

85191880 is an abundant number, since it is smaller than the sum of its proper divisors (106489940).

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

85191880 is a wasteful number, since it uses less digits than its factorization.

85191880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129808 (or 2129804 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 40.

The square root of 85191880 is about 9229.9447452301. The cubic root of 85191880 is about 440.0135670748.

The spelling of 85191880 in words is "eighty-five million, one hundred ninety-one thousand, eight hundred eighty".