28221052 has 6 divisors (see below), whose sum is σ = 49386848. Its totient is φ = 14110524.

The previous prime is 28221049. The next prime is 28221077. The reversal of 28221052 is 25012282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3527628 + ... + 3527635.

Almost surely, 2^28221052 is an apocalyptic number.

It is an amenable number.

28221052 is a deficient number, since it is larger than the sum of its proper divisors (21165796).

28221052 is a wasteful number, since it uses less digits than its factorization.

28221052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7055267 (or 7055265 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 28221052 is about 5312.3490096190. The cubic root of 28221052 is about 304.4559035514.

The spelling of 28221052 in words is "twenty-eight million, two hundred twenty-one thousand, fifty-two".