28678480 has 40 divisors (see below), whose sum is σ = 67183200. Its totient is φ = 11384448.

The previous prime is 28678471. The next prime is 28678483. The reversal of 28678480 is 8487682.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×28678480² = 1644910430220800, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28678483) 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, 9831 + ... + 12409.

It is an arithmetic number, because the mean of its divisors is an integer number (1679580).

Almost surely, 2^28678480 is an apocalyptic number.

28678480 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 28678480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33591600).

28678480 is an abundant number, since it is smaller than the sum of its proper divisors (38504720).

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

28678480 is a wasteful number, since it uses less digits than its factorization.

28678480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731 (or 2725 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 28678480 is about 5355.2292201175. The cubic root of 28678480 is about 306.0920451594.

The spelling of 28678480 in words is "twenty-eight million, six hundred seventy-eight thousand, four hundred eighty".