28520120 has 32 divisors (see below), whose sum is σ = 64523520. Its totient is φ = 11345280.

The previous prime is 28520119. The next prime is 28520131. The reversal of 28520120 is 2102582.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 28520092 and 28520101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5774 + ... + 9506.

It is an arithmetic number, because the mean of its divisors is an integer number (2016360).

Almost surely, 2^28520120 is an apocalyptic number.

28520120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28520120 is an abundant number, since it is smaller than the sum of its proper divisors (36003400).

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

28520120 is a wasteful number, since it uses less digits than its factorization.

28520120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3935 (or 3931 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 28520120 is about 5340.4232042040. The cubic root of 28520120 is about 305.5276006504.

The spelling of 28520120 in words is "twenty-eight million, five hundred twenty thousand, one hundred twenty".