990681264 has 60 divisors (see below), whose sum is σ = 2776105800. Its totient is φ = 329801472.

The previous prime is 990681193. The next prime is 990681269. The reversal of 990681264 is 462186099.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990681269) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 119692 + ... + 127700.

It is an arithmetic number, because the mean of its divisors is an integer number (46268430).

Almost surely, 2^990681264 is an apocalyptic number.

It is an amenable number.

990681264 is an abundant number, since it is smaller than the sum of its proper divisors (1785424536).

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

990681264 is a wasteful number, since it uses less digits than its factorization.

990681264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8882 (or 8873 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 990681264 is about 31475.0895789035. The cubic root of 990681264 is about 996.8840556418.

The spelling of 990681264 in words is "nine hundred ninety million, six hundred eighty-one thousand, two hundred sixty-four".