281663420 has 12 divisors (see below), whose sum is σ = 591493224. Its totient is φ = 112665360.

The previous prime is 281663411. The next prime is 281663423. The reversal of 281663420 is 24366182.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281663423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7041566 + ... + 7041605.

It is an arithmetic number, because the mean of its divisors is an integer number (49291102).

Almost surely, 2^281663420 is an apocalyptic number.

281663420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281663420 is an abundant number, since it is smaller than the sum of its proper divisors (309829804).

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

281663420 is a wasteful number, since it uses less digits than its factorization.

281663420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14083180 (or 14083178 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 281663420 is about 16782.8311080104. The cubic root of 281663420 is about 655.5062186156.

The spelling of 281663420 in words is "two hundred eighty-one million, six hundred sixty-three thousand, four hundred twenty".