28533552538 has 4 divisors (see below), whose sum is σ = 42800328810. Its totient is φ = 14266776268.

The previous prime is 28533552517. The next prime is 28533552547. The reversal of 28533552538 is 83525533582.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17362542289 + 11171010249 = 131767^2 + 105693^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28533552491 and 28533552500.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7133388133 + ... + 7133388136.

Almost surely, 2^28533552538 is an apocalyptic number.

28533552538 is a deficient number, since it is larger than the sum of its proper divisors (14266776272).

28533552538 is a wasteful number, since it uses less digits than its factorization.

28533552538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14266776271.

The product of its digits is 4320000, while the sum is 49.

The spelling of 28533552538 in words is "twenty-eight billion, five hundred thirty-three million, five hundred fifty-two thousand, five hundred thirty-eight".