999651456 has 128 divisors (see below), whose sum is σ = 2987620800. Its totient is φ = 333123840.

The previous prime is 999651403. The next prime is 999651467. The reversal of 999651456 is 654156999.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278151 + ... + 281721.

Almost surely, 2^999651456 is an apocalyptic number.

999651456 is a gapful number since it is divisible by the number (96) 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 999651456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1493810400).

999651456 is an abundant number, since it is smaller than the sum of its proper divisors (1987969344).

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

999651456 is an frugal number, since it uses more digits than its factorization.

999651456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3606 (or 3576 counting only the distinct ones).

The product of its digits is 2624400, while the sum is 54.

The square root of 999651456 is about 31617.2651568728. The cubic root of 999651456 is about 999.8838051660.

The spelling of 999651456 in words is "nine hundred ninety-nine million, six hundred fifty-one thousand, four hundred fifty-six".