990990432 has 72 divisors (see below), whose sum is σ = 2865943080. Its totient is φ = 324725760.

The previous prime is 990990431. The next prime is 990990433. The reversal of 990990432 is 234099099.

It is an interprime number because it is at equal distance from previous prime (990990431) and next prime (990990433).

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990990431) 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 11 ways as a sum of consecutive naturals, for example, 12169 + ... + 46152.

It is an arithmetic number, because the mean of its divisors is an integer number (39804765).

Almost surely, 2^990990432 is an apocalyptic number.

It is an amenable number.

990990432 is an abundant number, since it is smaller than the sum of its proper divisors (1874952648).

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

990990432 is a wasteful number, since it uses less digits than its factorization.

990990432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58396 (or 58385 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 990990432 is about 31480.0005082592. Note that the first 3 decimals coincide. The cubic root of 990990432 is about 996.9877461039.

The spelling of 990990432 in words is "nine hundred ninety million, nine hundred ninety thousand, four hundred thirty-two".