990909774 has 96 divisors (see below), whose sum is σ = 2358720000. Its totient is φ = 310915584.

The previous prime is 990909757. The next prime is 990909781. The reversal of 990909774 is 477909099.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 990909774.

It is a congruent 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 47 ways as a sum of consecutive naturals, for example, 2206702 + ... + 2207150.

It is an arithmetic number, because the mean of its divisors is an integer number (24570000).

Almost surely, 2^990909774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990909774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1179360000).

990909774 is an abundant number, since it is smaller than the sum of its proper divisors (1367810226).

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

990909774 is a wasteful number, since it uses less digits than its factorization.

990909774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724 (or 712 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 54.

The square root of 990909774 is about 31478.7193831007. The cubic root of 990909774 is about 996.9606966603.

The spelling of 990909774 in words is "nine hundred ninety million, nine hundred nine thousand, seven hundred seventy-four".