28199140 has 12 divisors (see below), whose sum is σ = 59218236. Its totient is φ = 11279648.

The previous prime is 28199137. The next prime is 28199153. The reversal of 28199140 is 4199182.

It can be written as a sum of positive squares in 2 ways, for example, as 7750656 + 20448484 = 2784^2 + 4522^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28199096 and 28199105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704959 + ... + 704998.

It is an arithmetic number, because the mean of its divisors is an integer number (4934853).

Almost surely, 2^28199140 is an apocalyptic number.

28199140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28199140 is an abundant number, since it is smaller than the sum of its proper divisors (31019096).

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

28199140 is a wasteful number, since it uses less digits than its factorization.

28199140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409966 (or 1409964 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 28199140 is about 5310.2862446388. The cubic root of 28199140 is about 304.3770857347.

The spelling of 28199140 in words is "twenty-eight million, one hundred ninety-nine thousand, one hundred forty".