990522000 has 640 divisors, whose sum is σ = 4094737920. Its totient is φ = 226713600.

The previous prime is 990521977. The next prime is 990522019. The reversal of 990522000 is 225099.

It is a super-2 number, since 2×990522000² = 1962267664968000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11933959 + ... + 11934041.

It is an arithmetic number, because the mean of its divisors is an integer number (6398028).

Almost surely, 2^990522000 is an apocalyptic number.

990522000 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990522000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2047368960).

990522000 is an abundant number, since it is smaller than the sum of its proper divisors (3104215920).

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

990522000 is a wasteful number, since it uses less digits than its factorization.

990522000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 990522000 is about 31472.5594764709. The cubic root of 990522000 is about 996.8306323876.

Adding to 990522000 its reverse (225099), we get a palindrome (990747099).

The spelling of 990522000 in words is "nine hundred ninety million, five hundred twenty-two thousand".