28765648 has 20 divisors (see below), whose sum is σ = 56649028. Its totient is φ = 14146560.

The previous prime is 28765643. The next prime is 28765657. The reversal of 28765648 is 84656782.

It can be written as a sum of positive squares in 2 ways, for example, as 3283344 + 25482304 = 1812^2 + 5048^2 .

It is a super-3 number, since 3×28765648³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28765598 and 28765607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28765643) 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, 13761 + ... + 15712.

Almost surely, 2^28765648 is an apocalyptic number.

It is an amenable number.

28765648 is a deficient number, since it is larger than the sum of its proper divisors (27883380).

28765648 is a wasteful number, since it uses less digits than its factorization.

28765648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29542 (or 29536 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 28765648 is about 5363.3616324093. The cubic root of 28765648 is about 306.4018528885.

The spelling of 28765648 in words is "twenty-eight million, seven hundred sixty-five thousand, six hundred forty-eight".