899216640 has 648 divisors, whose sum is σ = 3816802080. Its totient is φ = 202051584.

The previous prime is 899216623. The next prime is 899216653. The reversal of 899216640 is 46612998.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (648).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 15240931 + ... + 15240989.

Almost surely, 2^899216640 is an apocalyptic number.

899216640 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 899216640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1908401040).

899216640 is an abundant number, since it is smaller than the sum of its proper divisors (2917585440).

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

899216640 is an equidigital number, since it uses as much as digits as its factorization.

899216640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 899216640 is about 29986.9411577773. The cubic root of 899216640 is about 965.2091826405.

The spelling of 899216640 in words is "eight hundred ninety-nine million, two hundred sixteen thousand, six hundred forty".