899168640 has 128 divisors (see below), whose sum is σ = 2958750720. Its totient is φ = 232028160.

The previous prime is 899168639. The next prime is 899168653. The reversal of 899168640 is 46861998.

It is a happy number.

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

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, 51967 + ... + 67073.

It is an arithmetic number, because the mean of its divisors is an integer number (23115240).

Almost surely, 2^899168640 is an apocalyptic number.

899168640 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 899168640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1479375360).

899168640 is an abundant number, since it is smaller than the sum of its proper divisors (2059582080).

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

899168640 is a wasteful number, since it uses less digits than its factorization.

899168640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15160 (or 15148 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 899168640 is about 29986.1407987090. The cubic root of 899168640 is about 965.1920081121.

The spelling of 899168640 in words is "eight hundred ninety-nine million, one hundred sixty-eight thousand, six hundred forty".