280421568 has 224 divisors, whose sum is σ = 955852800. Its totient is φ = 78962688.

The previous prime is 280421563. The next prime is 280421573. The reversal of 280421568 is 865124082.

It is an interprime number because it is at equal distance from previous prime (280421563) and next prime (280421573).

It is a tau number, because it is divible by the number of its divisors (224).

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 (280421563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1173193 + ... + 1173431.

It is an arithmetic number, because the mean of its divisors is an integer number (4267200).

Almost surely, 2^280421568 is an apocalyptic number.

280421568 is a gapful number since it is divisible by the number (28) 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 280421568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (477926400).

280421568 is an abundant number, since it is smaller than the sum of its proper divisors (675431232).

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

280421568 is a wasteful number, since it uses less digits than its factorization.

280421568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 280421568 is about 16745.7925461890. The cubic root of 280421568 is about 654.5414252277.

The spelling of 280421568 in words is "two hundred eighty million, four hundred twenty-one thousand, five hundred sixty-eight".