28274540 has 24 divisors (see below), whose sum is σ = 67859232. Its totient is φ = 9694080.

The previous prime is 28274509. The next prime is 28274551. The reversal of 28274540 is 4547282.

It is a super-2 number, since 2×28274540² = 1598899224423200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28274497 and 28274506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100841 + ... + 101120.

It is an arithmetic number, because the mean of its divisors is an integer number (2827468).

Almost surely, 2^28274540 is an apocalyptic number.

28274540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28274540 is an abundant number, since it is smaller than the sum of its proper divisors (39584692).

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

28274540 is a wasteful number, since it uses less digits than its factorization.

28274540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201977 (or 201975 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 28274540 is about 5317.3809342570. The cubic root of 28274540 is about 304.6481295524.

The spelling of 28274540 in words is "twenty-eight million, two hundred seventy-four thousand, five hundred forty".