19878648 has 16 divisors (see below), whose sum is σ = 49696680. Its totient is φ = 6626208.

The previous prime is 19878641. The next prime is 19878653. The reversal of 19878648 is 84687891.

It is a self number, because there is not a number n which added to its sum of digits gives 19878648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19878641) 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, 414115 + ... + 414162.

Almost surely, 2^19878648 is an apocalyptic number.

It is an amenable number.

19878648 is an abundant number, since it is smaller than the sum of its proper divisors (29818032).

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

19878648 is a wasteful number, since it uses less digits than its factorization.

19878648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828286 (or 828282 counting only the distinct ones).

The product of its digits is 774144, while the sum is 51.

The square root of 19878648 is about 4458.5477456230. The cubic root of 19878648 is about 270.8916475195.

The spelling of 19878648 in words is "nineteen million, eight hundred seventy-eight thousand, six hundred forty-eight".