28709530000 has 50 divisors (see below), whose sum is σ = 69508667294. Its totient is φ = 11483808000.

The previous prime is 28709529983. The next prime is 28709530019. The reversal of 28709530000 is 3590782.

It can be written as a sum of positive squares in 5 ways, for example, as 3767013376 + 24942516624 = 61376^2 + 157932^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a super-2 number, since 2×28709530000² (a number of 22 digits) contains 22 as substring.

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 9 ways as a sum of consecutive naturals, for example, 1425477 + ... + 1445476.

Almost surely, 2^28709530000 is an apocalyptic number.

28709530000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28709530000 is an abundant number, since it is smaller than the sum of its proper divisors (40799137294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28709530000 is an equidigital number, since it uses as much as digits as its factorization.

28709530000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2870981 (or 2870960 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 28709530000 in words is "twenty-eight billion, seven hundred nine million, five hundred thirty thousand".