28478784 has 56 divisors (see below), whose sum is σ = 78638400. Its totient is φ = 9078784.

The previous prime is 28478773. The next prime is 28478797. The reversal of 28478784 is 48787482.

It is a happy number.

It is a super-2 number, since 2×28478784² = 1622082276237312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1192 + ... + 7640.

Almost surely, 2^28478784 is an apocalyptic number.

28478784 is a gapful number since it is divisible by the number (24) 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 28478784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39319200).

28478784 is an abundant number, since it is smaller than the sum of its proper divisors (50159616).

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

28478784 is a wasteful number, since it uses less digits than its factorization.

28478784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6487 (or 6477 counting only the distinct ones).

The product of its digits is 802816, while the sum is 48.

The square root of 28478784 is about 5336.5516956177. The cubic root of 28478784 is about 305.3799225049.

The spelling of 28478784 in words is "twenty-eight million, four hundred seventy-eight thousand, seven hundred eighty-four".