19640368 has 20 divisors (see below), whose sum is σ = 41512968. Its totient is φ = 8927360.

The previous prime is 19640363. The next prime is 19640371. The reversal of 19640368 is 86304691.

It is not an unprimeable number, because it can be changed into a prime (19640363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55621 + ... + 55972.

Almost surely, 2^19640368 is an apocalyptic number.

It is an amenable number.

19640368 is an abundant number, since it is smaller than the sum of its proper divisors (21872600).

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

19640368 is a wasteful number, since it uses less digits than its factorization.

19640368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111612 (or 111606 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 19640368 is about 4431.7454800564. The cubic root of 19640368 is about 269.8049253937.

The spelling of 19640368 in words is "nineteen million, six hundred forty thousand, three hundred sixty-eight".