999763128 has 256 divisors, whose sum is σ = 3599232000. Its totient is φ = 249702912.

The previous prime is 999763111. The next prime is 999763133. The reversal of 999763128 is 821367999.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 372126 + ... + 374802.

It is an arithmetic number, because the mean of its divisors is an integer number (14059500).

Almost surely, 2^999763128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999763128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1799616000).

999763128 is an abundant number, since it is smaller than the sum of its proper divisors (2599468872).

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

999763128 is a wasteful number, since it uses less digits than its factorization.

999763128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2731 (or 2721 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 999763128 is about 31619.0311047002. The cubic root of 999763128 is about 999.9210364316.

The spelling of 999763128 in words is "nine hundred ninety-nine million, seven hundred sixty-three thousand, one hundred twenty-eight".