28221376 has 14 divisors (see below), whose sum is σ = 56001920. Its totient is φ = 14110656.

The previous prime is 28221367. The next prime is 28221383. The reversal of 28221376 is 67312282.

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, 220416 + ... + 220543.

Almost surely, 2^28221376 is an apocalyptic number.

It is an amenable number.

28221376 is a deficient number, since it is larger than the sum of its proper divisors (27780544).

28221376 is an equidigital number, since it uses as much as digits as its factorization.

28221376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440971 (or 440961 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 28221376 is about 5312.3795045158. The cubic root of 28221376 is about 304.4570686785.

The spelling of 28221376 in words is "twenty-eight million, two hundred twenty-one thousand, three hundred seventy-six".