28475240 has 32 divisors (see below), whose sum is σ = 64260000. Its totient is φ = 11356224.

The previous prime is 28475203. The next prime is 28475261. The reversal of 28475240 is 4257482.

It is a junction number, because it is equal to n+sod(n) for n = 28475197 and 28475206.

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, 15911 + ... + 17609.

It is an arithmetic number, because the mean of its divisors is an integer number (2008125).

Almost surely, 2^28475240 is an apocalyptic number.

28475240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28475240 is an abundant number, since it is smaller than the sum of its proper divisors (35784760).

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

28475240 is a wasteful number, since it uses less digits than its factorization.

28475240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129 (or 2125 counting only the distinct ones).

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

The square root of 28475240 is about 5336.2196356597. The cubic root of 28475240 is about 305.3672544623.

The spelling of 28475240 in words is "twenty-eight million, four hundred seventy-five thousand, two hundred forty".