28570835221 has 16 divisors (see below), whose sum is σ = 30161182464. Its totient is φ = 27010266624.

The previous prime is 28570835201. The next prime is 28570835243. The reversal of 28570835221 is 12253807582.

It is a cyclic number.

It is not a de Polignac number, because 28570835221 - 2¹³ = 28570827029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28570835201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1716280 + ... + 1732846.

It is an arithmetic number, because the mean of its divisors is an integer number (1885073904).

Almost surely, 2^28570835221 is an apocalyptic number.

It is an amenable number.

28570835221 is a deficient number, since it is larger than the sum of its proper divisors (1590347243).

28570835221 is a wasteful number, since it uses less digits than its factorization.

28570835221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17460.

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 28570835221 in words is "twenty-eight billion, five hundred seventy million, eight hundred thirty-five thousand, two hundred twenty-one".