28557748 has 6 divisors (see below), whose sum is σ = 49976066. Its totient is φ = 14278872.

The previous prime is 28557731. The next prime is 28557757. The reversal of 28557748 is 84775582.

It can be written as a sum of positive squares in only one way, i.e., 28494244 + 63504 = 5338^2 + 252^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28557698 and 28557707.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3569715 + ... + 3569722.

Almost surely, 2^28557748 is an apocalyptic number.

It is an amenable number.

28557748 is a deficient number, since it is larger than the sum of its proper divisors (21418318).

28557748 is a wasteful number, since it uses less digits than its factorization.

28557748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7139441 (or 7139439 counting only the distinct ones).

The product of its digits is 627200, while the sum is 46.

The square root of 28557748 is about 5343.9449847468. The cubic root of 28557748 is about 305.6619074759.

The spelling of 28557748 in words is "twenty-eight million, five hundred fifty-seven thousand, seven hundred forty-eight".