28227620 has 24 divisors (see below), whose sum is σ = 59492664. Its totient is φ = 11250176.

The previous prime is 28227523. The next prime is 28227649. The reversal of 28227620 is 2672282.

It can be written as a sum of positive squares in 4 ways, for example, as 3467044 + 24760576 = 1862^2 + 4976^2 .

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, 3452 + ... + 8268.

It is an arithmetic number, because the mean of its divisors is an integer number (2478861).

Almost surely, 2^28227620 is an apocalyptic number.

28227620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28227620 is an abundant number, since it is smaller than the sum of its proper divisors (31265044).

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

28227620 is a wasteful number, since it uses less digits than its factorization.

28227620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5119 (or 5117 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 28227620 is about 5312.9671559309. The cubic root of 28227620 is about 304.4795208055.

The spelling of 28227620 in words is "twenty-eight million, two hundred twenty-seven thousand, six hundred twenty".