2168399520 has 576 divisors, whose sum is σ = 9057484800. Its totient is φ = 461666304.

The previous prime is 2168399503. The next prime is 2168399557. The reversal of 2168399520 is 259938612.

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

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 95 ways as a sum of consecutive naturals, for example, 10896381 + ... + 10896579.

It is an arithmetic number, because the mean of its divisors is an integer number (15724800).

Almost surely, 2^2168399520 is an apocalyptic number.

2168399520 is a gapful number since it is divisible by the number (20) 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 2168399520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4528742400).

2168399520 is an abundant number, since it is smaller than the sum of its proper divisors (6889085280).

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

2168399520 is a wasteful number, since it uses less digits than its factorization.

2168399520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 2168399520 is about 46566.0769230134. The cubic root of 2168399520 is about 1294.3342224537.

The spelling of 2168399520 in words is "two billion, one hundred sixty-eight million, three hundred ninety-nine thousand, five hundred twenty".