281681972 has 48 divisors (see below), whose sum is σ = 593296704. Its totient is φ = 115296000.

The previous prime is 281681969. The next prime is 281681977. The reversal of 281681972 is 279186182.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281681977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17447 + ... + 29457.

It is an arithmetic number, because the mean of its divisors is an integer number (12360348).

Almost surely, 2^281681972 is an apocalyptic number.

281681972 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

281681972 is an abundant number, since it is smaller than the sum of its proper divisors (311614732).

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

281681972 is a wasteful number, since it uses less digits than its factorization.

281681972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12080 (or 12078 counting only the distinct ones).

The product of its digits is 96768, while the sum is 44.

The square root of 281681972 is about 16783.3838066106. The cubic root of 281681972 is about 655.5206101240.

The spelling of 281681972 in words is "two hundred eighty-one million, six hundred eighty-one thousand, nine hundred seventy-two".