28210040 has 64 divisors (see below), whose sum is σ = 66679200. Its totient is φ = 10726912.

The previous prime is 28210037. The next prime is 28210057. The reversal of 28210040 is 4001282.

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, 96134 + ... + 96426.

Almost surely, 2^28210040 is an apocalyptic number.

28210040 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 28210040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33339600).

28210040 is an abundant number, since it is smaller than the sum of its proper divisors (38469160).

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

28210040 is a wasteful number, since it uses less digits than its factorization.

28210040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 28210040 is about 5311.3124555048. The cubic root of 28210040 is about 304.4162983118.

The spelling of 28210040 in words is "twenty-eight million, two hundred ten thousand, forty".