990891750 has 256 divisors, whose sum is σ = 2846638080. Its totient is φ = 228096000.

The previous prime is 990891739. The next prime is 990891751. The reversal of 990891750 is 57198099.

It is a self number, because there is not a number n which added to its sum of digits gives 990891750.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990891751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9090696 + ... + 9090804.

It is an arithmetic number, because the mean of its divisors is an integer number (11119680).

Almost surely, 2^990891750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990891750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1423319040).

990891750 is an abundant number, since it is smaller than the sum of its proper divisors (1855746330).

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

990891750 is a wasteful number, since it uses less digits than its factorization.

990891750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 990891750 is about 31478.4330931513. The cubic root of 990891750 is about 996.9546519362.

The spelling of 990891750 in words is "nine hundred ninety million, eight hundred ninety-one thousand, seven hundred fifty".