28757748 has 24 divisors (see below), whose sum is σ = 67731552. Its totient is φ = 9495904.

The previous prime is 28757741. The next prime is 28757777. The reversal of 28757748 is 84775782.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28757697 and 28757706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28757741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9915 + ... + 12482.

It is an arithmetic number, because the mean of its divisors is an integer number (2822148).

Almost surely, 2^28757748 is an apocalyptic number.

It is an amenable number.

28757748 is an abundant number, since it is smaller than the sum of its proper divisors (38973804).

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

28757748 is a wasteful number, since it uses less digits than its factorization.

28757748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22511 (or 22509 counting only the distinct ones).

The product of its digits is 878080, while the sum is 48.

The square root of 28757748 is about 5362.6251034358. The cubic root of 28757748 is about 306.3738009535.

It can be divided in two parts, 2875774 and 8, that added together give a palindrome (2875782).

The spelling of 28757748 in words is "twenty-eight million, seven hundred fifty-seven thousand, seven hundred forty-eight".