28003860 has 48 divisors (see below), whose sum is σ = 87124800. Its totient is φ = 7467552.

The previous prime is 28003831. The next prime is 28003873. The reversal of 28003860 is 6830082.

28003860 is a `hidden beast` number, since 280 + 0 + 386 + 0 = 666.

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 15 ways as a sum of consecutive naturals, for example, 25390 + ... + 26469.

It is an arithmetic number, because the mean of its divisors is an integer number (1815100).

Almost surely, 2^28003860 is an apocalyptic number.

28003860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28003860 is an abundant number, since it is smaller than the sum of its proper divisors (59120940).

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

28003860 is a wasteful number, since it uses less digits than its factorization.

28003860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51877 (or 51869 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28003860 is about 5291.8673452761. The cubic root of 28003860 is about 303.6728503957.

Subtracting from 28003860 its reverse (6830082), we obtain a triangular number (21173778 = T₆₅₀₇).

The spelling of 28003860 in words is "twenty-eight million, three thousand, eight hundred sixty".