28257792 has 40 divisors (see below), whose sum is σ = 75284616. Its totient is φ = 9418752.

The previous prime is 28257781. The next prime is 28257793. The reversal of 28257792 is 29775282.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28257793) 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 3 ways as a sum of consecutive naturals, for example, 7663 + ... + 10734.

Almost surely, 2^28257792 is an apocalyptic number.

It is an amenable number.

28257792 is an abundant number, since it is smaller than the sum of its proper divisors (47026824).

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

28257792 is an equidigital number, since it uses as much as digits as its factorization.

28257792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18418 (or 18402 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 28257792 is about 5315.8058655297. The cubic root of 28257792 is about 304.5879664208.

The spelling of 28257792 in words is "twenty-eight million, two hundred fifty-seven thousand, seven hundred ninety-two".