28912120 has 32 divisors (see below), whose sum is σ = 65318400. Its totient is φ = 11517568.

The previous prime is 28912099. The next prime is 28912151. The reversal of 28912120 is 2121982.

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, 9417 + ... + 12103.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200).

Almost surely, 2^28912120 is an apocalyptic number.

28912120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28912120 is an abundant number, since it is smaller than the sum of its proper divisors (36406280).

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

28912120 is a wasteful number, since it uses less digits than its factorization.

28912120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967 (or 2963 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 28912120 is about 5376.9991631020. Note that the first 3 decimals coincide. The cubic root of 28912120 is about 306.9210292480.

The spelling of 28912120 in words is "twenty-eight million, nine hundred twelve thousand, one hundred twenty".