28201840 has 20 divisors (see below), whose sum is σ = 65569464. Its totient is φ = 11280704.

The previous prime is 28201837. The next prime is 28201853. The reversal of 28201840 is 4810282.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176182 + ... + 176341.

Almost surely, 2^28201840 is an apocalyptic number.

28201840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28201840 is an abundant number, since it is smaller than the sum of its proper divisors (37367624).

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

28201840 is a wasteful number, since it uses less digits than its factorization.

28201840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352536 (or 352530 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 28201840 is about 5310.5404621375. The cubic root of 28201840 is about 304.3867998832.

The spelling of 28201840 in words is "twenty-eight million, two hundred one thousand, eight hundred forty".