28379840 has 56 divisors (see below), whose sum is σ = 68195952. Its totient is φ = 11248640.

The previous prime is 28379833. The next prime is 28379843. The reversal of 28379840 is 4897382.

It is not an unprimeable number, because it can be changed into a prime (28379843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41582 + ... + 42258.

Almost surely, 2^28379840 is an apocalyptic number.

28379840 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 28379840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34097976).

28379840 is an abundant number, since it is smaller than the sum of its proper divisors (39816112).

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

28379840 is a wasteful number, since it uses less digits than its factorization.

28379840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28379840 is about 5327.2732237046. The cubic root of 28379840 is about 305.0258510741.

The spelling of 28379840 in words is "twenty-eight million, three hundred seventy-nine thousand, eight hundred forty".