28204130521 has 8 divisors (see below), whose sum is σ = 32234529600. Its totient is φ = 24174040848.

The previous prime is 28204130497. The next prime is 28204130567. The reversal of 28204130521 is 12503140282.

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

It is a cyclic number.

It is not a de Polignac number, because 28204130521 - 2⁷ = 28204130393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28204130521.

It is not an unprimeable number, because it can be changed into a prime (28204130821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171270 + ... + 292816.

It is an arithmetic number, because the mean of its divisors is an integer number (4029316200).

Almost surely, 2^28204130521 is an apocalyptic number.

It is an amenable number.

28204130521 is a deficient number, since it is larger than the sum of its proper divisors (4030399079).

28204130521 is a wasteful number, since it uses less digits than its factorization.

28204130521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154703.

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 28204130521 in words is "twenty-eight billion, two hundred four million, one hundred thirty thousand, five hundred twenty-one".