28355860 has 48 divisors (see below), whose sum is σ = 64576512. Its totient is φ = 10396800.

The previous prime is 28355857. The next prime is 28355863. The reversal of 28355860 is 6855382.

It is an interprime number because it is at equal distance from previous prime (28355857) and next prime (28355863).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28355863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49375 + ... + 49945.

It is an arithmetic number, because the mean of its divisors is an integer number (1345344).

Almost surely, 2^28355860 is an apocalyptic number.

28355860 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 28355860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32288256).

28355860 is an abundant number, since it is smaller than the sum of its proper divisors (36220652).

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

28355860 is a wasteful number, since it uses less digits than its factorization.

28355860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 28355860 is about 5325.0220656820. The cubic root of 28355860 is about 304.9399147070.

The spelling of 28355860 in words is "twenty-eight million, three hundred fifty-five thousand, eight hundred sixty".