899289840 has 80 divisors (see below), whose sum is σ = 2792776608. Its totient is φ = 239382528.

The previous prime is 899289803. The next prime is 899289863. The reversal of 899289840 is 48982998.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 145044 + ... + 151116.

Almost surely, 2^899289840 is an apocalyptic number.

899289840 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 899289840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1396388304).

899289840 is an abundant number, since it is smaller than the sum of its proper divisors (1893486768).

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

899289840 is a wasteful number, since it uses less digits than its factorization.

899289840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6706 (or 6700 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 57.

The square root of 899289840 is about 29988.1616642301. The cubic root of 899289840 is about 965.2353726196.

The spelling of 899289840 in words is "eight hundred ninety-nine million, two hundred eighty-nine thousand, eight hundred forty".