19640068 has 24 divisors (see below), whose sum is σ = 40989312. Its totient is φ = 8050944.

The previous prime is 19640063. The next prime is 19640069. The reversal of 19640068 is 86004691.

It is not an unprimeable number, because it can be changed into a prime (19640063) 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, 14605 + ... + 15892.

It is an arithmetic number, because the mean of its divisors is an integer number (1707888).

Almost surely, 2^19640068 is an apocalyptic number.

It is an amenable number.

19640068 is an abundant number, since it is smaller than the sum of its proper divisors (21349244).

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

19640068 is a wasteful number, since it uses less digits than its factorization.

19640068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30531 (or 30529 counting only the distinct ones).

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

The square root of 19640068 is about 4431.7116332180. The cubic root of 19640068 is about 269.8035516603.

The spelling of 19640068 in words is "nineteen million, six hundred forty thousand, sixty-eight".