28512120 has 192 divisors, whose sum is σ = 107442720. Its totient is φ = 5999616.

The previous prime is 28512101. The next prime is 28512131. The reversal of 28512120 is 2121582.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76254 + ... + 76626.

Almost surely, 2^28512120 is an apocalyptic number.

28512120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28512120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53721360).

28512120 is an abundant number, since it is smaller than the sum of its proper divisors (78930600).

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

28512120 is a wasteful number, since it uses less digits than its factorization.

28512120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 28512120 is about 5339.6741473614. The cubic root of 28512120 is about 305.4990307685.

The spelling of 28512120 in words is "twenty-eight million, five hundred twelve thousand, one hundred twenty".