28318100 has 18 divisors (see below), whose sum is σ = 61450494. Its totient is φ = 11327200.

The previous prime is 28318093. The next prime is 28318117. The reversal of 28318100 is 181382.

It can be written as a sum of positive squares in 3 ways, for example, as 4072324 + 24245776 = 2018^2 + 4924^2 .

It is a super-2 number, since 2×28318100² = 1603829575220000, which 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 5 ways as a sum of consecutive naturals, for example, 141491 + ... + 141690.

Almost surely, 2^28318100 is an apocalyptic number.

28318100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28318100 is an abundant number, since it is smaller than the sum of its proper divisors (33132394).

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

28318100 is a wasteful number, since it uses less digits than its factorization.

28318100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283195 (or 283188 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 28318100 is about 5321.4753593341. The cubic root of 28318100 is about 304.8044971241.

Adding to 28318100 its reverse (181382), we get a palindrome (28499482).

The spelling of 28318100 in words is "twenty-eight million, three hundred eighteen thousand, one hundred".