28175540 has 24 divisors (see below), whose sum is σ = 59278632. Its totient is φ = 11249280.

The previous prime is 28175527. The next prime is 28175573. The reversal of 28175540 is 4557182.

It can be written as a sum of positive squares in 4 ways, for example, as 676 + 28174864 = 26^2 + 5308^2 .

It is a super-2 number, since 2×28175540² = 1587722108583200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28175497 and 28175506.

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, 14210 + ... + 16070.

It is an arithmetic number, because the mean of its divisors is an integer number (2469943).

Almost surely, 2^28175540 is an apocalyptic number.

28175540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28175540 is an abundant number, since it is smaller than the sum of its proper divisors (31103092).

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

28175540 is a wasteful number, since it uses less digits than its factorization.

28175540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627 (or 2625 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 28175540 is about 5308.0636770860. The cubic root of 28175540 is about 304.2921504723.

The spelling of 28175540 in words is "twenty-eight million, one hundred seventy-five thousand, five hundred forty".