28280807500 has 60 divisors (see below), whose sum is σ = 67466759976. Its totient is φ = 10283920000.

The previous prime is 28280807479. The next prime is 28280807561. The reversal of 28280807500 is 570808282.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 486697 + ... + 541696.

Almost surely, 2^28280807500 is an apocalyptic number.

28280807500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28280807500 is an abundant number, since it is smaller than the sum of its proper divisors (39185952476).

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

28280807500 is a wasteful number, since it uses less digits than its factorization.

28280807500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028428 (or 1028411 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 40.

The spelling of 28280807500 in words is "twenty-eight billion, two hundred eighty million, eight hundred seven thousand, five hundred".