28494720 has 256 divisors, whose sum is σ = 107956800. Its totient is φ = 7077888.

The previous prime is 28494707. The next prime is 28494721. The reversal of 28494720 is 2749482.

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

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28494721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 293712 + ... + 293808.

Almost surely, 2^28494720 is an apocalyptic number.

28494720 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 28494720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53978400).

28494720 is an abundant number, since it is smaller than the sum of its proper divisors (79462080).

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

28494720 is a wasteful number, since it uses less digits than its factorization.

28494720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 124 counting only the distinct ones).

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

The square root of 28494720 is about 5338.0445858011. The cubic root of 28494720 is about 305.4368728180.

It can be divided in two parts, 2849 and 4720, that added together give a square (7569 = 87²).

The spelling of 28494720 in words is "twenty-eight million, four hundred ninety-four thousand, seven hundred twenty".