21674328 has 64 divisors (see below), whose sum is σ = 58920960. Its totient is φ = 6604416.

The previous prime is 21674327. The next prime is 21674333. The reversal of 21674328 is 82347612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21674327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39351 + ... + 39897.

It is an arithmetic number, because the mean of its divisors is an integer number (920640).

Almost surely, 2^21674328 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 21674328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29460480).

21674328 is an abundant number, since it is smaller than the sum of its proper divisors (37246632).

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

21674328 is a wasteful number, since it uses less digits than its factorization.

21674328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 692 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 21674328 is about 4655.5695677328. The cubic root of 21674328 is about 278.8144087592.

The spelling of 21674328 in words is "twenty-one million, six hundred seventy-four thousand, three hundred twenty-eight".