28088440 has 16 divisors (see below), whose sum is σ = 63199080. Its totient is φ = 11235360.

The previous prime is 28088413. The next prime is 28088447. The reversal of 28088440 is 4488082.

It is a junction number, because it is equal to n+sod(n) for n = 28088396 and 28088405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28088447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351066 + ... + 351145.

Almost surely, 2^28088440 is an apocalyptic number.

28088440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28088440 is an abundant number, since it is smaller than the sum of its proper divisors (35110640).

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

28088440 is a wasteful number, since it uses less digits than its factorization.

28088440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702222 (or 702218 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 34.

The square root of 28088440 is about 5299.8528281453. The cubic root of 28088440 is about 303.9782706075.

The spelling of 28088440 in words is "twenty-eight million, eighty-eight thousand, four hundred forty".