280423800 has 144 divisors (see below), whose sum is σ = 953610840. Its totient is φ = 73839360.

The previous prime is 280423763. The next prime is 280423807. The reversal of 280423800 is 8324082.

280423800 is a `hidden beast` number, since 280 + 4 + 2 + 380 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280423807) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 148462 + ... + 150338.

Almost surely, 2^280423800 is an apocalyptic number.

280423800 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 280423800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (476805420).

280423800 is an abundant number, since it is smaller than the sum of its proper divisors (673187040).

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

280423800 is a wasteful number, since it uses less digits than its factorization.

280423800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982 (or 1970 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 280423800 is about 16745.8591896624. The cubic root of 280423800 is about 654.5431618186.

Adding to 280423800 its reverse (8324082), we get a palindrome (288747882).

The spelling of 280423800 in words is "two hundred eighty million, four hundred twenty-three thousand, eight hundred".