28273860 has 120 divisors (see below), whose sum is σ = 91719936. Its totient is φ = 7283520.

The previous prime is 28273859. The next prime is 28273871. The reversal of 28273860 is 6837282.

It is a happy number.

It is a super-2 number, since 2×28273860² = 1598822318599200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 49939 + ... + 50501.

Almost surely, 2^28273860 is an apocalyptic number.

28273860 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 28273860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45859968).

28273860 is an abundant number, since it is smaller than the sum of its proper divisors (63446076).

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

28273860 is a wasteful number, since it uses less digits than its factorization.

28273860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28273860 is about 5317.3169926195. The cubic root of 28273860 is about 304.6456872800.

The spelling of 28273860 in words is "twenty-eight million, two hundred seventy-three thousand, eight hundred sixty".