28773547836 has 72 divisors (see below), whose sum is σ = 73872839040. Its totient is φ = 8710252320.

The previous prime is 28773547823. The next prime is 28773547841. The reversal of 28773547836 is 63874537782.

It is a self number, because there is not a number n which added to its sum of digits gives 28773547836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1469865 + ... + 1489311.

Almost surely, 2^28773547836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28773547836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36936419520).

28773547836 is an abundant number, since it is smaller than the sum of its proper divisors (45099291204).

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

28773547836 is a wasteful number, since it uses less digits than its factorization.

28773547836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20495 (or 20482 counting only the distinct ones).

The product of its digits is 47416320, while the sum is 60.

The spelling of 28773547836 in words is "twenty-eight billion, seven hundred seventy-three million, five hundred forty-seven thousand, eight hundred thirty-six".