28475140 has 12 divisors (see below), whose sum is σ = 59797836. Its totient is φ = 11390048.

The previous prime is 28475099. The next prime is 28475147. The reversal of 28475140 is 4157482.

It can be written as a sum of positive squares in 2 ways, for example, as 20088324 + 8386816 = 4482^2 + 2896^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28475147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711859 + ... + 711898.

It is an arithmetic number, because the mean of its divisors is an integer number (4983153).

Almost surely, 2^28475140 is an apocalyptic number.

28475140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28475140 is an abundant number, since it is smaller than the sum of its proper divisors (31322696).

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

28475140 is a wasteful number, since it uses less digits than its factorization.

28475140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423766 (or 1423764 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 28475140 is about 5336.2102657223. The cubic root of 28475140 is about 305.3668969967.

The spelling of 28475140 in words is "twenty-eight million, four hundred seventy-five thousand, one hundred forty".