28140120 has 48 divisors (see below), whose sum is σ = 91456560. Its totient is φ = 7503936.

The previous prime is 28140097. The next prime is 28140131. The reversal of 28140120 is 2104182.

It is a super-2 number, since 2×28140120² = 1583732707228800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 28140093 and 28140102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38724 + ... + 39443.

It is an arithmetic number, because the mean of its divisors is an integer number (1905345).

Almost surely, 2^28140120 is an apocalyptic number.

28140120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28140120 is an abundant number, since it is smaller than the sum of its proper divisors (63316440).

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

28140120 is a wasteful number, since it uses less digits than its factorization.

28140120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78184 (or 78177 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 28140120 is about 5304.7261946306. The cubic root of 28140120 is about 304.1645865457.

It can be divided in two parts, 281 and 40120, that added together give a square (40401 = 201²).

The spelling of 28140120 in words is "twenty-eight million, one hundred forty thousand, one hundred twenty".