28905712 has 40 divisors (see below), whose sum is σ = 64696752. Its totient is φ = 12364800.

The previous prime is 28905691. The next prime is 28905713. The reversal of 28905712 is 21750982.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28905713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1839 + ... + 7822.

Almost surely, 2^28905712 is an apocalyptic number.

28905712 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28905712 is an abundant number, since it is smaller than the sum of its proper divisors (35791040).

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

28905712 is a wasteful number, since it uses less digits than its factorization.

28905712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9697 (or 9691 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28905712 is about 5376.4032586851. The cubic root of 28905712 is about 306.8983525381.

The spelling of 28905712 in words is "twenty-eight million, nine hundred five thousand, seven hundred twelve".