28193100 has 72 divisors (see below), whose sum is σ = 87858960. Its totient is φ = 6938880.

The previous prime is 28193071. The next prime is 28193119. The reversal of 28193100 is 139182.

It is a super-2 number, since 2×28193100² = 1589701775220000, which 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, 286 + ... + 7514.

Almost surely, 2^28193100 is an apocalyptic number.

28193100 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 28193100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43929480).

28193100 is an abundant number, since it is smaller than the sum of its proper divisors (59665860).

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

28193100 is a wasteful number, since it uses less digits than its factorization.

28193100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7259 (or 7252 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 28193100 is about 5309.7175066099. The cubic root of 28193100 is about 304.3553525793.

The spelling of 28193100 in words is "twenty-eight million, one hundred ninety-three thousand, one hundred".