28928240749 has 8 divisors (see below), whose sum is σ = 29057420600. Its totient is φ = 28799318016.

The previous prime is 28928240741. The next prime is 28928240797. The reversal of 28928240749 is 94704282982.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7890768900 + 21037471849 = 88830^2 + 145043^2 .

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 28928240749 - 2³ = 28928240741 is a prime.

It is a super-2 number, since 2×28928240749² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28928240749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28928240741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163027 + ... + 290575.

It is an arithmetic number, because the mean of its divisors is an integer number (3632177575).

Almost surely, 2^28928240749 is an apocalyptic number.

It is an amenable number.

28928240749 is a deficient number, since it is larger than the sum of its proper divisors (129179851).

28928240749 is a wasteful number, since it uses less digits than its factorization.

28928240749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128559.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 28928240749 in words is "twenty-eight billion, nine hundred twenty-eight million, two hundred forty thousand, seven hundred forty-nine".