28540732 has 12 divisors (see below), whose sum is σ = 54486936. Its totient is φ = 12973040.

The previous prime is 28540697. The next prime is 28540751. The reversal of 28540732 is 23704582.

It is a junction number, because it is equal to n+sod(n) for n = 28540694 and 28540703.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 324283 + ... + 324370.

It is an arithmetic number, because the mean of its divisors is an integer number (4540578).

Almost surely, 2^28540732 is an apocalyptic number.

28540732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28540732 is a deficient number, since it is larger than the sum of its proper divisors (25946204).

28540732 is a wasteful number, since it uses less digits than its factorization.

28540732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648668 (or 648666 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 28540732 is about 5342.3526652590. The cubic root of 28540732 is about 305.6011863435.

The spelling of 28540732 in words is "twenty-eight million, five hundred forty thousand, seven hundred thirty-two".