281636628 has 96 divisors (see below), whose sum is σ = 820114176. Its totient is φ = 73239552.

The previous prime is 281636611. The next prime is 281636717. The reversal of 281636628 is 826636182.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 281636628.

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 31 ways as a sum of consecutive naturals, for example, 77950 + ... + 81482.

It is an arithmetic number, because the mean of its divisors is an integer number (8542856).

Almost surely, 2^281636628 is an apocalyptic number.

281636628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 281636628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (410057088).

281636628 is an abundant number, since it is smaller than the sum of its proper divisors (538477548).

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

281636628 is a wasteful number, since it uses less digits than its factorization.

281636628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633 (or 3631 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 281636628 is about 16782.0328923525. The cubic root of 281636628 is about 655.4854339033.

The spelling of 281636628 in words is "two hundred eighty-one million, six hundred thirty-six thousand, six hundred twenty-eight".