28572784 has 40 divisors (see below), whose sum is σ = 59460480. Its totient is φ = 13252608.

The previous prime is 28572781. The next prime is 28572787. The reversal of 28572784 is 48727582.

It is an interprime number because it is at equal distance from previous prime (28572781) and next prime (28572787).

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28572784.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28572781) 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, 19137 + ... + 20575.

It is an arithmetic number, because the mean of its divisors is an integer number (1486512).

Almost surely, 2^28572784 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 28572784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29730240).

28572784 is an abundant number, since it is smaller than the sum of its proper divisors (30887696).

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

28572784 is a wasteful number, since it uses less digits than its factorization.

28572784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537 (or 1531 counting only the distinct ones).

The product of its digits is 250880, while the sum is 43.

The square root of 28572784 is about 5345.3516254780. The cubic root of 28572784 is about 305.7155429618.

The spelling of 28572784 in words is "twenty-eight million, five hundred seventy-two thousand, seven hundred eighty-four".