28170120 has 64 divisors (see below), whose sum is σ = 92197440. Its totient is φ = 6828800.

The previous prime is 28170119. The next prime is 28170127. The reversal of 28170120 is 2107182.

It is not an unprimeable number, because it can be changed into a prime (28170127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9351 + ... + 11990.

It is an arithmetic number, because the mean of its divisors is an integer number (1440585).

Almost surely, 2^28170120 is an apocalyptic number.

28170120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28170120 is an abundant number, since it is smaller than the sum of its proper divisors (64027320).

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

28170120 is a wasteful number, since it uses less digits than its factorization.

28170120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21366 (or 21362 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 28170120 is about 5307.5531085426. The cubic root of 28170120 is about 304.2726374571.

The spelling of 28170120 in words is "twenty-eight million, one hundred seventy thousand, one hundred twenty".