19668264 has 128 divisors (see below), whose sum is σ = 63590400. Its totient is φ = 4919040.

The previous prime is 19668263. The next prime is 19668277. The reversal of 19668264 is 46286691.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19668263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53409 + ... + 53775.

It is an arithmetic number, because the mean of its divisors is an integer number (496800).

Almost surely, 2^19668264 is an apocalyptic number.

19668264 is a gapful number since it is divisible by the number (14) 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 19668264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31795200).

19668264 is an abundant number, since it is smaller than the sum of its proper divisors (43922136).

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

19668264 is a wasteful number, since it uses less digits than its factorization.

19668264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 419 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 19668264 is about 4434.8916559483. The cubic root of 19668264 is about 269.9326032054.

The spelling of 19668264 in words is "nineteen million, six hundred sixty-eight thousand, two hundred sixty-four".