28947732 has 24 divisors (see below), whose sum is σ = 73685472. Its totient is φ = 8772000.

The previous prime is 28947691. The next prime is 28947739. The reversal of 28947732 is 23774982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28947739) 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 7 ways as a sum of consecutive naturals, for example, 109519 + ... + 109782.

It is an arithmetic number, because the mean of its divisors is an integer number (3070228).

Almost surely, 2^28947732 is an apocalyptic number.

28947732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28947732 is an abundant number, since it is smaller than the sum of its proper divisors (44737740).

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

28947732 is a wasteful number, since it uses less digits than its factorization.

28947732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219319 (or 219317 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 28947732 is about 5380.3096565161. The cubic root of 28947732 is about 307.0469924210.

The spelling of 28947732 in words is "twenty-eight million, nine hundred forty-seven thousand, seven hundred thirty-two".