21880328 has 16 divisors (see below), whose sum is σ = 41091180. Its totient is φ = 10922688.

The previous prime is 21880321. The next prime is 21880367. The reversal of 21880328 is 82308812.

It can be written as a sum of positive squares in 2 ways, for example, as 19695844 + 2184484 = 4438^2 + 1478^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21880294 and 21880303.

It is not an unprimeable number, because it can be changed into a prime (21880321) 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, 4250 + ... + 7862.

Almost surely, 2^21880328 is an apocalyptic number.

It is an amenable number.

21880328 is a deficient number, since it is larger than the sum of its proper divisors (19210852).

21880328 is a wasteful number, since it uses less digits than its factorization.

21880328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4376 (or 4372 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 21880328 is about 4677.6412859474. The cubic root of 21880328 is about 279.6949398664.

The spelling of 21880328 in words is "twenty-one million, eight hundred eighty thousand, three hundred twenty-eight".