899781120 has 360 divisors, whose sum is σ = 3629509884. Its totient is φ = 205406208.

The previous prime is 899781109. The next prime is 899781161. The reversal of 899781120 is 21187998.

It can be written as a sum of positive squares in 2 ways, for example, as 894249216 + 5531904 = 29904^2 + 2352^2 .

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1128562 + ... + 1129358.

Almost surely, 2^899781120 is an apocalyptic number.

899781120 is a gapful number since it is divisible by the number (80) 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 899781120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814754942).

899781120 is an abundant number, since it is smaller than the sum of its proper divisors (2729728764).

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

899781120 is a wasteful number, since it uses less digits than its factorization.

899781120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 899781120 is about 29996.3517781746. The cubic root of 899781120 is about 965.4111092537.

The spelling of 899781120 in words is "eight hundred ninety-nine million, seven hundred eighty-one thousand, one hundred twenty".