19328868 has 90 divisors (see below), whose sum is σ = 54870354. Its totient is φ = 5930496.

The previous prime is 19328863. The next prime is 19328879. The reversal of 19328868 is 86882391.

It can be written as a sum of positive squares in 3 ways, for example, as 39204 + 19289664 = 198^2 + 4392^2 .

It is a super-2 number, since 2×19328868² = 747210276322848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19328863) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 54580 + ... + 54932.

Almost surely, 2^19328868 is an apocalyptic number.

19328868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19328868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27435177).

19328868 is an abundant number, since it is smaller than the sum of its proper divisors (35541486).

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

19328868 is a wasteful number, since it uses less digits than its factorization.

19328868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 371 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 19328868 is about 4396.4608493651. The cubic root of 19328868 is about 268.3709313810.

The spelling of 19328868 in words is "nineteen million, three hundred twenty-eight thousand, eight hundred sixty-eight".