28865003520 has 136 divisors (see below), whose sum is σ = 92370452256. Its totient is φ = 7697072128.

The previous prime is 28865003501. The next prime is 28865003533. The reversal of 28865003520 is 2530056882.

It is a super-2 number, since 2×28865003520² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 968359 + ... + 997721.

Almost surely, 2^28865003520 is an apocalyptic number.

28865003520 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 28865003520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46185226128).

28865003520 is an abundant number, since it is smaller than the sum of its proper divisors (63505448736).

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

28865003520 is an frugal number, since it uses more digits than its factorization.

28865003520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29403 (or 29373 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 28865003520 in words is "twenty-eight billion, eight hundred sixty-five million, three thousand, five hundred twenty".