28573707920 has 80 divisors (see below), whose sum is σ = 67207400832. Its totient is φ = 11296834560.

The previous prime is 28573707913. The next prime is 28573707923. The reversal of 28573707920 is 2970737582.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (28573707923) 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, 4702004 + ... + 4708076.

Almost surely, 2^28573707920 is an apocalyptic number.

28573707920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28573707920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33603700416).

28573707920 is an abundant number, since it is smaller than the sum of its proper divisors (38633692912).

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

28573707920 is a wasteful number, since it uses less digits than its factorization.

28573707920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6760 (or 6754 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 50.

The spelling of 28573707920 in words is "twenty-eight billion, five hundred seventy-three million, seven hundred seven thousand, nine hundred twenty".