28008420 has 48 divisors (see below), whose sum is σ = 85555008. Its totient is φ = 6789760.

The previous prime is 28008397. The next prime is 28008443. The reversal of 28008420 is 2480082.

It is an interprime number because it is at equal distance from previous prime (28008397) and next prime (28008443).

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, 20559 + ... + 21878.

It is an arithmetic number, because the mean of its divisors is an integer number (1782396).

Almost surely, 2^28008420 is an apocalyptic number.

28008420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28008420 is an abundant number, since it is smaller than the sum of its proper divisors (57546588).

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

28008420 is a wasteful number, since it uses less digits than its factorization.

28008420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42460 (or 42458 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 28008420 is about 5292.2981775406. The cubic root of 28008420 is about 303.6893323265.

The spelling of 28008420 in words is "twenty-eight million, eight thousand, four hundred twenty".