19640608 has 48 divisors (see below), whose sum is σ = 43013376. Its totient is φ = 8766720.

The previous prime is 19640603. The next prime is 19640633. The reversal of 19640608 is 80604691.

It is not an unprimeable number, because it can be changed into a prime (19640603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12135 + ... + 13657.

It is an arithmetic number, because the mean of its divisors is an integer number (896112).

Almost surely, 2^19640608 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 19640608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21506688).

19640608 is an abundant number, since it is smaller than the sum of its proper divisors (23372768).

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

19640608 is a wasteful number, since it uses less digits than its factorization.

19640608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577 (or 1569 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 19640608 is about 4431.7725573409. The cubic root of 19640608 is about 269.8060243704.

It can be divided in two parts, 196 and 40608, that added together give a palindrome (40804).

The spelling of 19640608 in words is "nineteen million, six hundred forty thousand, six hundred eight".