28847220 has 24 divisors (see below), whose sum is σ = 80772384. Its totient is φ = 7692576.

The previous prime is 28847219. The next prime is 28847243. The reversal of 28847220 is 2274882.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240334 + ... + 240453.

It is an arithmetic number, because the mean of its divisors is an integer number (3365516).

Almost surely, 2^28847220 is an apocalyptic number.

28847220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28847220 is an abundant number, since it is smaller than the sum of its proper divisors (51925164).

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

28847220 is a wasteful number, since it uses less digits than its factorization.

28847220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480799 (or 480797 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 28847220 is about 5370.9608079002. The cubic root of 28847220 is about 306.6912052408.

The spelling of 28847220 in words is "twenty-eight million, eight hundred forty-seven thousand, two hundred twenty".