281979386352 has 200 divisors, whose sum is σ = 844325553456. Its totient is φ = 90783120384.

The previous prime is 281979386329. The next prime is 281979386401. The reversal of 281979386352 is 253683979182.

281979386352 is a `hidden beast` number, since 2 + 8 + 197 + 93 + 8 + 6 + 352 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 281979386352.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6547963 + ... + 6590885.

Almost surely, 2^281979386352 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 281979386352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (422162776728).

281979386352 is an abundant number, since it is smaller than the sum of its proper divisors (562346167104).

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

281979386352 is a wasteful number, since it uses less digits than its factorization.

281979386352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43117 (or 43102 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 63.

The spelling of 281979386352 in words is "two hundred eighty-one billion, nine hundred seventy-nine million, three hundred eighty-six thousand, three hundred fifty-two".