28018532500 has 60 divisors (see below), whose sum is σ = 70023960160. Its totient is φ = 9606348000.

The previous prime is 28018532491. The next prime is 28018532501. The reversal of 28018532500 is 523581082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28018532501) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 783030 + ... + 818029.

Almost surely, 2^28018532500 is an apocalyptic number.

28018532500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28018532500 is an abundant number, since it is smaller than the sum of its proper divisors (42005427660).

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

28018532500 is a wasteful number, since it uses less digits than its factorization.

28018532500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601090 (or 1601073 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 28018532500 in words is "twenty-eight billion, eighteen million, five hundred thirty-two thousand, five hundred".