85491090 has 48 divisors (see below), whose sum is σ = 228293208. Its totient is φ = 22180608.

The previous prime is 85491061. The next prime is 85491139. The reversal of 85491090 is 9019458.

85491090 is a `hidden beast` number, since 8 + 549 + 109 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 85322169 + 168921 = 9237^2 + 411^2 .

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 9507 + ... + 16166.

Almost surely, 2^85491090 is an apocalyptic number.

85491090 is an abundant number, since it is smaller than the sum of its proper divisors (142802118).

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

85491090 is a wasteful number, since it uses less digits than its factorization.

85491090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25723 (or 25720 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 85491090 is about 9246.1391942800. The cubic root of 85491090 is about 440.5281021272.

The spelling of 85491090 in words is "eighty-five million, four hundred ninety-one thousand, ninety".