281379968 has 128 divisors (see below), whose sum is σ = 627912000. Its totient is φ = 125079552.

The previous prime is 281379941. The next prime is 281379977. The reversal of 281379968 is 869973182.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4769123 + ... + 4769181.

Almost surely, 2^281379968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 281379968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313956000).

281379968 is an abundant number, since it is smaller than the sum of its proper divisors (346532032).

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

281379968 is a wasteful number, since it uses less digits than its factorization.

281379968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 170 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 53.

The square root of 281379968 is about 16774.3842808015. The cubic root of 281379968 is about 655.2862552380.

The spelling of 281379968 in words is "two hundred eighty-one million, three hundred seventy-nine thousand, nine hundred sixty-eight".