28871140 has 12 divisors (see below), whose sum is σ = 60629436. Its totient is φ = 11548448.

The previous prime is 28871131. The next prime is 28871159. The reversal of 28871140 is 4117882.

It can be written as a sum of positive squares in 2 ways, for example, as 22429696 + 6441444 = 4736^2 + 2538^2 .

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, 721759 + ... + 721798.

It is an arithmetic number, because the mean of its divisors is an integer number (5052453).

Almost surely, 2^28871140 is an apocalyptic number.

28871140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28871140 is an abundant number, since it is smaller than the sum of its proper divisors (31758296).

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

28871140 is a wasteful number, since it uses less digits than its factorization.

28871140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443566 (or 1443564 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 28871140 is about 5373.1871361418. The cubic root of 28871140 is about 306.7759508638.

The spelling of 28871140 in words is "twenty-eight million, eight hundred seventy-one thousand, one hundred forty".