990895620 has 144 divisors (see below), whose sum is σ = 3284568000. Its totient is φ = 221717760.

The previous prime is 990895613. The next prime is 990895621. The reversal of 990895620 is 26598099.

It is a self number, because there is not a number n which added to its sum of digits gives 990895620.

It is not an unprimeable number, because it can be changed into a prime (990895621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89131 + ... + 99629.

It is an arithmetic number, because the mean of its divisors is an integer number (22809500).

Almost surely, 2^990895620 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 990895620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1642284000).

990895620 is an abundant number, since it is smaller than the sum of its proper divisors (2293672380).

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

990895620 is a wasteful number, since it uses less digits than its factorization.

990895620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10546 (or 10533 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 990895620 is about 31478.4945637494. The cubic root of 990895620 is about 996.9559498275.

The spelling of 990895620 in words is "nine hundred ninety million, eight hundred ninety-five thousand, six hundred twenty".