28503493100 has 72 divisors (see below), whose sum is σ = 63353236800. Its totient is φ = 11126200320.

The previous prime is 28503493097. The next prime is 28503493111. The reversal of 28503493100 is 139430582.

It is a super-2 number, since 2×28503493100² (a number of 22 digits) contains 22 as substring.

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, 1631612 + ... + 1648988.

Almost surely, 2^28503493100 is an apocalyptic number.

28503493100 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 28503493100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31676618400).

28503493100 is an abundant number, since it is smaller than the sum of its proper divisors (34849743700).

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

28503493100 is a wasteful number, since it uses less digits than its factorization.

28503493100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17787 (or 17780 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 28503493100 in words is "twenty-eight billion, five hundred three million, four hundred ninety-three thousand, one hundred".