28286620 has 12 divisors (see below), whose sum is σ = 59401944. Its totient is φ = 11314640.

The previous prime is 28286617. The next prime is 28286633. The reversal of 28286620 is 2668282.

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, 707146 + ... + 707185.

It is an arithmetic number, because the mean of its divisors is an integer number (4950162).

Almost surely, 2^28286620 is an apocalyptic number.

28286620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28286620 is an abundant number, since it is smaller than the sum of its proper divisors (31115324).

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

28286620 is a wasteful number, since it uses less digits than its factorization.

28286620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414340 (or 1414338 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 28286620 is about 5318.5167105124. The cubic root of 28286620 is about 304.6915092788.

The spelling of 28286620 in words is "twenty-eight million, two hundred eighty-six thousand, six hundred twenty".