28773471780 has 48 divisors (see below), whose sum is σ = 89517469440. Its totient is φ = 7672925664.

The previous prime is 28773471773. The next prime is 28773471781. The reversal of 28773471780 is 8717437782.

28773471780 is a `hidden beast` number, since 28 + 7 + 73 + 471 + 7 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (28773471781) 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, 26641564 + ... + 26642643.

It is an arithmetic number, because the mean of its divisors is an integer number (1864947280).

Almost surely, 2^28773471780 is an apocalyptic number.

28773471780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28773471780 is an abundant number, since it is smaller than the sum of its proper divisors (60743997660).

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

28773471780 is a wasteful number, since it uses less digits than its factorization.

28773471780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53284225 (or 53284217 counting only the distinct ones).

The product of its (nonzero) digits is 3687936, while the sum is 54.

The spelling of 28773471780 in words is "twenty-eight billion, seven hundred seventy-three million, four hundred seventy-one thousand, seven hundred eighty".