28283780 has 120 divisors (see below), whose sum is σ = 75290880. Its totient is φ = 8890560.

The previous prime is 28283779. The next prime is 28283797. The reversal of 28283780 is 8738282.

It is a super-2 number, since 2×28283780² = 1599944422176800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 912365 + ... + 912395.

It is an arithmetic number, because the mean of its divisors is an integer number (627424).

Almost surely, 2^28283780 is an apocalyptic number.

28283780 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 28283780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37645440).

28283780 is an abundant number, since it is smaller than the sum of its proper divisors (47007100).

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

28283780 is a wasteful number, since it uses less digits than its factorization.

28283780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 28283780 is about 5318.2497120763. The cubic root of 28283780 is about 304.6813118445.

The spelling of 28283780 in words is "twenty-eight million, two hundred eighty-three thousand, seven hundred eighty".