28708020 has 168 divisors, whose sum is σ = 99156960. Its totient is φ = 6920640.

The previous prime is 28708007. The next prime is 28708039. The reversal of 28708020 is 2080782.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 160291 + ... + 160469.

It is an arithmetic number, because the mean of its divisors is an integer number (590220).

Almost surely, 2^28708020 is an apocalyptic number.

28708020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28708020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49578480).

28708020 is an abundant number, since it is smaller than the sum of its proper divisors (70448940).

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

28708020 is a wasteful number, since it uses less digits than its factorization.

28708020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 28708020 is about 5357.9865621332. The cubic root of 28708020 is about 306.1971048448.

The spelling of 28708020 in words is "twenty-eight million, seven hundred eight thousand, twenty".