281630164 has 24 divisors (see below), whose sum is σ = 509470976. Its totient is φ = 136080000.

The previous prime is 281630137. The next prime is 281630171. The reversal of 281630164 is 461036182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129244 + ... + 131404.

Almost surely, 2^281630164 is an apocalyptic number.

It is an amenable number.

281630164 is a deficient number, since it is larger than the sum of its proper divisors (227840812).

281630164 is a wasteful number, since it uses less digits than its factorization.

281630164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247 (or 3245 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 281630164 is about 16781.8403043290. The cubic root of 281630164 is about 655.4804190605.

The spelling of 281630164 in words is "two hundred eighty-one million, six hundred thirty thousand, one hundred sixty-four".