28280376 has 48 divisors (see below), whose sum is σ = 78048360. Its totient is φ = 9247680.

The previous prime is 28280353. The next prime is 28280431. The reversal of 28280376 is 67308282.

It is a happy number.

28280376 is a `hidden beast` number, since 2 + 8 + 280 + 376 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28280376.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111 + ... + 7521.

Almost surely, 2^28280376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28280376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39024180).

28280376 is an abundant number, since it is smaller than the sum of its proper divisors (49767984).

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

28280376 is a wasteful number, since it uses less digits than its factorization.

28280376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7476 (or 7469 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28280376 is about 5317.9296723443. The cubic root of 28280376 is about 304.6690883865.

The spelling of 28280376 in words is "twenty-eight million, two hundred eighty thousand, three hundred seventy-six".