28443340 has 24 divisors (see below), whose sum is σ = 61189632. Its totient is φ = 11099520.

The previous prime is 28443313. The next prime is 28443367. The reversal of 28443340 is 4334482.

It is an interprime number because it is at equal distance from previous prime (28443313) and next prime (28443367).

It is a junction number, because it is equal to n+sod(n) for n = 28443299 and 28443308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16524 + ... + 18163.

It is an arithmetic number, because the mean of its divisors is an integer number (2549568).

Almost surely, 2^28443340 is an apocalyptic number.

28443340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28443340 is an abundant number, since it is smaller than the sum of its proper divisors (32746292).

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

28443340 is a wasteful number, since it uses less digits than its factorization.

28443340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34737 (or 34735 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 28443340 is about 5333.2297906616. The cubic root of 28443340 is about 305.2531804424.

The spelling of 28443340 in words is "twenty-eight million, four hundred forty-three thousand, three hundred forty".