28030860 has 240 divisors, whose sum is σ = 104160672. Its totient is φ = 6272640.

The previous prime is 28030853. The next prime is 28030861. The reversal of 28030860 is 6803082.

It is a super-2 number, since 2×28030860² = 1571458224679200, which contains 22 as substring.

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

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 429 × 165 × 396.

It is not an unprimeable number, because it can be changed into a prime (28030861) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2156214 + ... + 2156226.

Almost surely, 2^28030860 is an apocalyptic number.

28030860 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 28030860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52080336).

28030860 is an abundant number, since it is smaller than the sum of its proper divisors (76129812).

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

28030860 is a wasteful number, since it uses less digits than its factorization.

28030860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28030860 is about 5294.4178150199. The cubic root of 28030860 is about 303.7704147230.

The spelling of 28030860 in words is "twenty-eight million, thirty thousand, eight hundred sixty".