28378784 has 24 divisors (see below), whose sum is σ = 63852768. Its totient is φ = 12162240.

The previous prime is 28378781. The next prime is 28378787. The reversal of 28378784 is 48787382.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28378781) and next prime (28378787).

It is not an unprimeable number, because it can be changed into a prime (28378781) 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, 63122 + ... + 63569.

It is an arithmetic number, because the mean of its divisors is an integer number (2660532).

Almost surely, 2^28378784 is an apocalyptic number.

It is an amenable number.

28378784 is an abundant number, since it is smaller than the sum of its proper divisors (35473984).

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

28378784 is a wasteful number, since it uses less digits than its factorization.

28378784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126708 (or 126700 counting only the distinct ones).

The product of its digits is 602112, while the sum is 47.

The square root of 28378784 is about 5327.1741101638. The cubic root of 28378784 is about 305.0220677395.

The spelling of 28378784 in words is "twenty-eight million, three hundred seventy-eight thousand, seven hundred eighty-four".