28643699530 has 16 divisors (see below), whose sum is σ = 51820381800. Its totient is φ = 11399319232.

The previous prime is 28643699503. The next prime is 28643699597. The reversal of 28643699530 is 3599634682.

It can be written as a sum of positive squares in 4 ways, for example, as 25033251961 + 3610447569 = 158219^2 + 60087^2 .

It is an unprimeable number.

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, 7268005 + ... + 7271944.

Almost surely, 2^28643699530 is an apocalyptic number.

28643699530 is a deficient number, since it is larger than the sum of its proper divisors (23176682270).

28643699530 is a wasteful number, since it uses less digits than its factorization.

28643699530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14540153.

The product of its (nonzero) digits is 8398080, while the sum is 55.

The spelling of 28643699530 in words is "twenty-eight billion, six hundred forty-three million, six hundred ninety-nine thousand, five hundred thirty".