28172340 has 192 divisors, whose sum is σ = 104025600. Its totient is φ = 6193152.

The previous prime is 28172299. The next prime is 28172341. The reversal of 28172340 is 4327182.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28172341) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 109492 + ... + 109748.

It is an arithmetic number, because the mean of its divisors is an integer number (541800).

Almost surely, 2^28172340 is an apocalyptic number.

28172340 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 28172340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52012800).

28172340 is an abundant number, since it is smaller than the sum of its proper divisors (75853260).

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

28172340 is a wasteful number, since it uses less digits than its factorization.

28172340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 28172340 is about 5307.7622403420. The cubic root of 28172340 is about 304.2806301755.

The spelling of 28172340 in words is "twenty-eight million, one hundred seventy-two thousand, three hundred forty".