281991996 has 288 divisors, whose sum is σ = 934214400. Its totient is φ = 72316800.

The previous prime is 281991991. The next prime is 281992013. The reversal of 281991996 is 699199182.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281991991) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9096501 + ... + 9096531.

It is an arithmetic number, because the mean of its divisors is an integer number (3243800).

Almost surely, 2^281991996 is an apocalyptic number.

281991996 is a gapful number since it is divisible by the number (26) 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 281991996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (467107200).

281991996 is an abundant number, since it is smaller than the sum of its proper divisors (652222404).

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

281991996 is a wasteful number, since it uses less digits than its factorization.

281991996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 79 counting only the distinct ones).

The product of its digits is 629856, while the sum is 54.

The square root of 281991996 is about 16792.6173064237. The cubic root of 281991996 is about 655.7610143493.

The spelling of 281991996 in words is "two hundred eighty-one million, nine hundred ninety-one thousand, nine hundred ninety-six".