85631490 has 192 divisors, whose sum is σ = 271814400. Its totient is φ = 18289152.

The previous prime is 85631489. The next prime is 85631521. The reversal of 85631490 is 9413658.

85631490 is a `hidden beast` number, since 8 + 563 + 1 + 4 + 90 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 785556 + ... + 785664.

It is an arithmetic number, because the mean of its divisors is an integer number (1415700).

Almost surely, 2^85631490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85631490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135907200).

85631490 is an abundant number, since it is smaller than the sum of its proper divisors (186182910).

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

85631490 is a wasteful number, since it uses less digits than its factorization.

85631490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 85631490 is about 9253.7284377704. The cubic root of 85631490 is about 440.7691265351.

The spelling of 85631490 in words is "eighty-five million, six hundred thirty-one thousand, four hundred ninety".