28032140 has 12 divisors (see below), whose sum is σ = 58867536. Its totient is φ = 11212848.

The previous prime is 28032131. The next prime is 28032143. The reversal of 28032140 is 4123082.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1401607 = 28032140 / (2 + 8 + 0 + 3 + 2 + 1 + 4 + 0).

It is not an unprimeable number, because it can be changed into a prime (28032143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700784 + ... + 700823.

It is an arithmetic number, because the mean of its divisors is an integer number (4905628).

Almost surely, 2^28032140 is an apocalyptic number.

28032140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28032140 is an abundant number, since it is smaller than the sum of its proper divisors (30835396).

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

28032140 is a wasteful number, since it uses less digits than its factorization.

28032140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401616 (or 1401614 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28032140 is about 5294.5386956750. The cubic root of 28032140 is about 303.7750384391.

The spelling of 28032140 in words is "twenty-eight million, thirty-two thousand, one hundred forty".