90858636 has 54 divisors (see below), whose sum is σ = 251073732. Its totient is φ = 27475440.

The previous prime is 90858631. The next prime is 90858641. The reversal of 90858636 is 63685809.

90858636 is a `hidden beast` number, since 9 + 0 + 8 + 5 + 8 + 636 = 666.

It is an interprime number because it is at equal distance from previous prime (90858631) and next prime (90858641).

It is a junction number, because it is equal to n+sod(n) for n = 90858591 and 90858600.

It is not an unprimeable number, because it can be changed into a prime (90858631) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 189445 + ... + 189923.

Almost surely, 2^90858636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90858636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125536866).

90858636 is an abundant number, since it is smaller than the sum of its proper divisors (160215096).

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

90858636 is a wasteful number, since it uses less digits than its factorization.

90858636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 495 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 90858636 is about 9531.9796474814. The cubic root of 90858636 is about 449.5611128311.

The spelling of 90858636 in words is "ninety million, eight hundred fifty-eight thousand, six hundred thirty-six".