28785628573 has 16 divisors (see below), whose sum is σ = 32833500336. Its totient is φ = 25000657920.

The previous prime is 28785628559. The next prime is 28785628583. The reversal of 28785628573 is 37582658782.

It can be written as a sum of positive squares in 8 ways, for example, as 1995140889 + 26790487684 = 44667^2 + 163678^2 .

It is a cyclic number.

It is not a de Polignac number, because 28785628573 - 2⁹ = 28785628061 is a prime.

It is a super-2 number, since 2×28785628573² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785628513) 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, 773215 + ... + 809587.

It is an arithmetic number, because the mean of its divisors is an integer number (2052093771).

Almost surely, 2^28785628573 is an apocalyptic number.

It is an amenable number.

28785628573 is a deficient number, since it is larger than the sum of its proper divisors (4047871763).

28785628573 is a wasteful number, since it uses less digits than its factorization.

28785628573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39984.

The product of its digits is 45158400, while the sum is 61.

The spelling of 28785628573 in words is "twenty-eight billion, seven hundred eighty-five million, six hundred twenty-eight thousand, five hundred seventy-three".