999327780 has 384 divisors, whose sum is σ = 3597189120. Its totient is φ = 230947200.

The previous prime is 999327739. The next prime is 999327787. The reversal of 999327780 is 87723999.

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

It is not an unprimeable number, because it can be changed into a prime (999327787) 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 127 ways as a sum of consecutive naturals, for example, 14915307 + ... + 14915373.

It is an arithmetic number, because the mean of its divisors is an integer number (9367680).

Almost surely, 2^999327780 is an apocalyptic number.

999327780 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 999327780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1798594560).

999327780 is an abundant number, since it is smaller than the sum of its proper divisors (2597861340).

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

999327780 is a wasteful number, since it uses less digits than its factorization.

999327780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 54.

The square root of 999327780 is about 31612.1460834281. The cubic root of 999327780 is about 999.7758764390.

It can be divided in two parts, 9993 and 27780, that added together give a palindrome (37773).

The spelling of 999327780 in words is "nine hundred ninety-nine million, three hundred twenty-seven thousand, seven hundred eighty".