28238620 has 12 divisors (see below), whose sum is σ = 59301144. Its totient is φ = 11295440.

The previous prime is 28238611. The next prime is 28238621. The reversal of 28238620 is 2683282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28238621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705946 + ... + 705985.

It is an arithmetic number, because the mean of its divisors is an integer number (4941762).

Almost surely, 2^28238620 is an apocalyptic number.

28238620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28238620 is an abundant number, since it is smaller than the sum of its proper divisors (31062524).

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

28238620 is a wasteful number, since it uses less digits than its factorization.

28238620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411940 (or 1411938 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 28238620 is about 5314.0022581854. The cubic root of 28238620 is about 304.5190664675.

The spelling of 28238620 in words is "twenty-eight million, two hundred thirty-eight thousand, six hundred twenty".