28573643520 has 216 divisors, whose sum is σ = 104677949376. Its totient is φ = 7171375104.

The previous prime is 28573643519. The next prime is 28573643531. The reversal of 28573643520 is 2534637582.

28573643520 is a `hidden beast` number, since 2 + 8 + 57 + 36 + 43 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 122889 + ... + 268791.

It is an arithmetic number, because the mean of its divisors is an integer number (484620136).

Almost surely, 2^28573643520 is an apocalyptic number.

28573643520 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 28573643520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52338974688).

28573643520 is an abundant number, since it is smaller than the sum of its proper divisors (76104305856).

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

28573643520 is a wasteful number, since it uses less digits than its factorization.

28573643520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145947 (or 145930 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 45.

The spelling of 28573643520 in words is "twenty-eight billion, five hundred seventy-three million, six hundred forty-three thousand, five hundred twenty".