19425664 has 32 divisors (see below), whose sum is σ = 39535200. Its totient is φ = 9503232.

The previous prime is 19425649. The next prime is 19425701. The reversal of 19425664 is 46652491.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4402 + ... + 7630.

It is an arithmetic number, because the mean of its divisors is an integer number (1235475).

Almost surely, 2^19425664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19425664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19767600).

19425664 is an abundant number, since it is smaller than the sum of its proper divisors (20109536).

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

19425664 is an equidigital number, since it uses as much as digits as its factorization.

19425664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290 (or 3278 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 19425664 is about 4407.4555017606. The cubic root of 19425664 is about 268.8181724298.

The spelling of 19425664 in words is "nineteen million, four hundred twenty-five thousand, six hundred sixty-four".