999622764 has 72 divisors (see below), whose sum is σ = 2892734208. Its totient is φ = 285118560.

The previous prime is 999622753. The next prime is 999622769. The reversal of 999622764 is 467226999.

999622764 is a `hidden beast` number, since 9 + 9 + 9 + 622 + 7 + 6 + 4 = 666.

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

999622764 is a modest number, since divided by 22764 gives 9996 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 999622764.

It is not an unprimeable number, because it can be changed into a prime (999622769) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159979 + ... + 166109.

It is an arithmetic number, because the mean of its divisors is an integer number (40176864).

Almost surely, 2^999622764 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 999622764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1446367104).

999622764 is an abundant number, since it is smaller than the sum of its proper divisors (1893111444).

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

999622764 is a wasteful number, since it uses less digits than its factorization.

999622764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6795 (or 6790 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 999622764 is about 31616.8114141828. The cubic root of 999622764 is about 999.8742388515.

The spelling of 999622764 in words is "nine hundred ninety-nine million, six hundred twenty-two thousand, seven hundred sixty-four".