28585220 has 12 divisors (see below), whose sum is σ = 60029004. Its totient is φ = 11434080.

The previous prime is 28585217. The next prime is 28585231. The reversal of 28585220 is 2258582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4946176 + 23639044 = 2224^2 + 4862^2 .

It is a super-2 number, since 2×28585220² = 1634229604896800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 714611 + ... + 714650.

It is an arithmetic number, because the mean of its divisors is an integer number (5002417).

Almost surely, 2^28585220 is an apocalyptic number.

28585220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28585220 is an abundant number, since it is smaller than the sum of its proper divisors (31443784).

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

28585220 is a wasteful number, since it uses less digits than its factorization.

28585220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429270 (or 1429268 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 28585220 is about 5346.5147526216. The cubic root of 28585220 is about 305.7598896736.

The spelling of 28585220 in words is "twenty-eight million, five hundred eighty-five thousand, two hundred twenty".