990587136 has 216 divisors, whose sum is σ = 3347041824. Its totient is φ = 257187840.

The previous prime is 990587123. The next prime is 990587137. The reversal of 990587136 is 631785099.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (990587137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 412756 + ... + 415148.

It is an arithmetic number, because the mean of its divisors is an integer number (15495564).

Almost surely, 2^990587136 is an apocalyptic number.

990587136 is a gapful number since it is divisible by the number (96) 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 990587136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1673520912).

990587136 is an abundant number, since it is smaller than the sum of its proper divisors (2356454688).

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

990587136 is a wasteful number, since it uses less digits than its factorization.

990587136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2437 (or 2416 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 990587136 is about 31473.5942656698. The cubic root of 990587136 is about 996.8524821923.

The spelling of 990587136 in words is "nine hundred ninety million, five hundred eighty-seven thousand, one hundred thirty-six".