28705860 has 192 divisors, whose sum is σ = 97977600. Its totient is φ = 6948864.

The previous prime is 28705847. The next prime is 28705891. The reversal of 28705860 is 6850782.

28705860 is a `hidden beast` number, since 2 + 8 + 70 + 586 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 486511 + ... + 486569.

It is an arithmetic number, because the mean of its divisors is an integer number (510300).

Almost surely, 2^28705860 is an apocalyptic number.

28705860 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 28705860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48988800).

28705860 is an abundant number, since it is smaller than the sum of its proper divisors (69271740).

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

28705860 is a wasteful number, since it uses less digits than its factorization.

28705860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 28705860 is about 5357.7849900869. The cubic root of 28705860 is about 306.1894251983.

The spelling of 28705860 in words is "twenty-eight million, seven hundred five thousand, eight hundred sixty".