28478250 has 64 divisors (see below), whose sum is σ = 78998400. Its totient is φ = 7592400.

The previous prime is 28478237. The next prime is 28478251. The reversal of 28478250 is 5287482.

It is a happy number.

It is a super-2 number, since 2×28478250² = 1622021446125000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28478251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4641 + ... + 8859.

It is an arithmetic number, because the mean of its divisors is an integer number (1234350).

Almost surely, 2^28478250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28478250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39499200).

28478250 is an abundant number, since it is smaller than the sum of its proper divisors (50520150).

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

28478250 is a wasteful number, since it uses less digits than its factorization.

28478250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245 (or 4229 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28478250 is about 5336.5016630748. The cubic root of 28478250 is about 305.3780137869.

The spelling of 28478250 in words is "twenty-eight million, four hundred seventy-eight thousand, two hundred fifty".