28748765 has 8 divisors (see below), whose sum is σ = 34751160. Its totient is φ = 22830592.

The previous prime is 28748761. The next prime is 28748771. The reversal of 28748765 is 56784782.

It can be written as a sum of positive squares in 4 ways, for example, as 2748964 + 25999801 = 1658^2 + 5099^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28748765 - 2² = 28748761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28748761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20300 + ... + 21669.

It is an arithmetic number, because the mean of its divisors is an integer number (4343895).

Almost surely, 2^28748765 is an apocalyptic number.

It is an amenable number.

28748765 is a deficient number, since it is larger than the sum of its proper divisors (6002395).

28748765 is a wasteful number, since it uses less digits than its factorization.

28748765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42111.

The product of its digits is 752640, while the sum is 47.

The square root of 28748765 is about 5361.7874818012. The cubic root of 28748765 is about 306.3418971750.

The spelling of 28748765 in words is "twenty-eight million, seven hundred forty-eight thousand, seven hundred sixty-five".