28170940 has 48 divisors (see below), whose sum is σ = 69801984. Its totient is φ = 9345600.

The previous prime is 28170937. The next prime is 28170953. The reversal of 28170940 is 4907182.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1095 + ... + 7585.

It is an arithmetic number, because the mean of its divisors is an integer number (1454208).

Almost surely, 2^28170940 is an apocalyptic number.

28170940 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 28170940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34900992).

28170940 is an abundant number, since it is smaller than the sum of its proper divisors (41631044).

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

28170940 is a wasteful number, since it uses less digits than its factorization.

28170940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6538 (or 6536 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28170940 is about 5307.6303563832. The cubic root of 28170940 is about 304.2755897713.

The spelling of 28170940 in words is "twenty-eight million, one hundred seventy thousand, nine hundred forty".