16201640 has 64 divisors (see below), whose sum is σ = 44876160. Its totient is φ = 5126400.

The previous prime is 16201621. The next prime is 16201657. The reversal of 16201640 is 4610261.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 1415 + ... + 5865.

It is an arithmetic number, because the mean of its divisors is an integer number (701190).

Almost surely, 2^16201640 is an apocalyptic number.

16201640 is a gapful number since it is divisible by the number (10) 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 16201640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22438080).

16201640 is an abundant number, since it is smaller than the sum of its proper divisors (28674520).

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

16201640 is a wasteful number, since it uses less digits than its factorization.

16201640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4482 (or 4478 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 16201640 is about 4025.1260849817. The cubic root of 16201640 is about 253.0383377566.

The spelling of 16201640 in words is "sixteen million, two hundred one thousand, six hundred forty".