28785694452 has 12 divisors (see below), whose sum is σ = 67166620416. Its totient is φ = 9595231480.

The previous prime is 28785694451. The next prime is 28785694471. The reversal of 28785694452 is 25449658782.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785694451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1199403924 + ... + 1199403947.

It is an arithmetic number, because the mean of its divisors is an integer number (5597218368).

Almost surely, 2^28785694452 is an apocalyptic number.

It is an amenable number.

28785694452 is an abundant number, since it is smaller than the sum of its proper divisors (38380925964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28785694452 is a wasteful number, since it uses less digits than its factorization.

28785694452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398807878 (or 2398807876 counting only the distinct ones).

The product of its digits is 38707200, while the sum is 60.

The spelling of 28785694452 in words is "twenty-eight billion, seven hundred eighty-five million, six hundred ninety-four thousand, four hundred fifty-two".