28352140 has 24 divisors (see below), whose sum is σ = 61593840. Its totient is φ = 10949568.

The previous prime is 28352119. The next prime is 28352143. The reversal of 28352140 is 4125382.

It is not an unprimeable number, because it can be changed into a prime (28352143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23862 + ... + 25021.

It is an arithmetic number, because the mean of its divisors is an integer number (2566410).

Almost surely, 2^28352140 is an apocalyptic number.

28352140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28352140 is an abundant number, since it is smaller than the sum of its proper divisors (33241700).

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

28352140 is a wasteful number, since it uses less digits than its factorization.

28352140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48921 (or 48919 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28352140 is about 5324.6727598980. The cubic root of 28352140 is about 304.9265791202.

The spelling of 28352140 in words is "twenty-eight million, three hundred fifty-two thousand, one hundred forty".