28280757 has 4 divisors (see below), whose sum is σ = 37707680. Its totient is φ = 18853836.

The previous prime is 28280753. The next prime is 28280761. The reversal of 28280757 is 75708282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28280753) and next prime (28280761).

It is not a de Polignac number, because 28280757 - 2² = 28280753 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28280753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4713457 + ... + 4713462.

It is an arithmetic number, because the mean of its divisors is an integer number (9426920).

Almost surely, 2^28280757 is an apocalyptic number.

It is an amenable number.

28280757 is a deficient number, since it is larger than the sum of its proper divisors (9426923).

28280757 is an equidigital number, since it uses as much as digits as its factorization.

28280757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9426922.

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 28280757 is about 5317.9654944349. The cubic root of 28280757 is about 304.6704565720.

The spelling of 28280757 in words is "twenty-eight million, two hundred eighty thousand, seven hundred fifty-seven".