28135808210 has 8 divisors (see below), whose sum is σ = 50644454796. Its totient is φ = 11254323280.

The previous prime is 28135808191. The next prime is 28135808249. The reversal of 28135808210 is 1280853182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25256519929 + 2879288281 = 158923^2 + 53659^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1406790401 + ... + 1406790420.

Almost surely, 2^28135808210 is an apocalyptic number.

28135808210 is a deficient number, since it is larger than the sum of its proper divisors (22508646586).

28135808210 is a wasteful number, since it uses less digits than its factorization.

28135808210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813580828.

The product of its (nonzero) digits is 30720, while the sum is 38.

The spelling of 28135808210 in words is "twenty-eight billion, one hundred thirty-five million, eight hundred eight thousand, two hundred ten".