28773332920 has 32 divisors (see below), whose sum is σ = 64925532000. Its totient is φ = 11476349568.

The previous prime is 28773332909. The next prime is 28773332921. The reversal of 28773332920 is 2923337782.

It is a Smith number, since the sum of its digits (46) 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 (28773332921) 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, 1016604 + ... + 1044523.

It is an arithmetic number, because the mean of its divisors is an integer number (2028922875).

Almost surely, 2^28773332920 is an apocalyptic number.

28773332920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28773332920 is an abundant number, since it is smaller than the sum of its proper divisors (36152199080).

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

28773332920 is a wasteful number, since it uses less digits than its factorization.

28773332920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061487 (or 2061483 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 46.

The spelling of 28773332920 in words is "twenty-eight billion, seven hundred seventy-three million, three hundred thirty-two thousand, nine hundred twenty".