28511509652 has 24 divisors (see below), whose sum is σ = 51457545216. Its totient is φ = 13814575488.

The previous prime is 28511509613. The next prime is 28511509679. The reversal of 28511509652 is 25690511582.

It is a super-2 number, since 2×28511509652² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 630773 + ... + 674460.

It is an arithmetic number, because the mean of its divisors is an integer number (2144064384).

Almost surely, 2^28511509652 is an apocalyptic number.

It is an amenable number.

28511509652 is a deficient number, since it is larger than the sum of its proper divisors (22946035564).

28511509652 is a wasteful number, since it uses less digits than its factorization.

28511509652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305407 (or 1305405 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 44.

The spelling of 28511509652 in words is "twenty-eight billion, five hundred eleven million, five hundred nine thousand, six hundred fifty-two".