28173390 has 128 divisors (see below), whose sum is σ = 85155840. Its totient is φ = 5816448.

The previous prime is 28173373. The next prime is 28173407. The reversal of 28173390 is 9337182.

It is an interprime number because it is at equal distance from previous prime (28173373) and next prime (28173407).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 91617 + ... + 91923.

It is an arithmetic number, because the mean of its divisors is an integer number (665280).

Almost surely, 2^28173390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28173390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42577920).

28173390 is an abundant number, since it is smaller than the sum of its proper divisors (56982450).

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

28173390 is a wasteful number, since it uses less digits than its factorization.

28173390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 28173390 is about 5307.8611511606. The cubic root of 28173390 is about 304.2844103690.

The spelling of 28173390 in words is "twenty-eight million, one hundred seventy-three thousand, three hundred ninety".