999648450 has 144 divisors (see below), whose sum is σ = 2866055400. Its totient is φ = 248924160.

The previous prime is 999648449. The next prime is 999648469. The reversal of 999648450 is 54846999.

It can be written as a sum of positive squares in 12 ways, for example, as 130165281 + 869483169 = 11409^2 + 29487^2 .

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1139412 + ... + 1140288.

Almost surely, 2^999648450 is an apocalyptic number.

999648450 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 999648450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1433027700).

999648450 is an abundant number, since it is smaller than the sum of its proper divisors (1866406950).

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

999648450 is a wasteful number, since it uses less digits than its factorization.

999648450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061 (or 1053 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 999648450 is about 31617.2176195186. The cubic root of 999648450 is about 999.8828029321.

The spelling of 999648450 in words is "nine hundred ninety-nine million, six hundred forty-eight thousand, four hundred fifty".