28140480 has 112 divisors (see below), whose sum is σ = 99303840. Its totient is φ = 7501824.

The previous prime is 28140479. The next prime is 28140487. The reversal of 28140480 is 8404182.

It is a super-2 number, since 2×28140480² = 1583773229260800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 (28140487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7012 + ... + 10268.

Almost surely, 2^28140480 is an apocalyptic number.

28140480 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 28140480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49651920).

28140480 is an abundant number, since it is smaller than the sum of its proper divisors (71163360).

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

28140480 is a wasteful number, since it uses less digits than its factorization.

28140480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3283 (or 3267 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28140480 is about 5304.7601265279. The cubic root of 28140480 is about 304.1658836118.

The spelling of 28140480 in words is "twenty-eight million, one hundred forty thousand, four hundred eighty".