280893420 has 144 divisors (see below), whose sum is σ = 914528160. Its totient is φ = 72285696.

The previous prime is 280893407. The next prime is 280893421. The reversal of 280893420 is 24398082.

It is a super-2 number, since 2×280893420² = 157802226798592800, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (280893421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139944 + ... + 141936.

It is an arithmetic number, because the mean of its divisors is an integer number (6350890).

Almost surely, 2^280893420 is an apocalyptic number.

280893420 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 280893420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (457264080).

280893420 is an abundant number, since it is smaller than the sum of its proper divisors (633634740).

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

280893420 is a wasteful number, since it uses less digits than its factorization.

280893420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046 (or 2032 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 280893420 is about 16759.8752978654. The cubic root of 280893420 is about 654.9083413882.

The spelling of 280893420 in words is "two hundred eighty million, eight hundred ninety-three thousand, four hundred twenty".