281422890 has 128 divisors (see below), whose sum is σ = 872087040. Its totient is φ = 63244800.

The previous prime is 281422877. The next prime is 281422907. The reversal of 281422890 is 98224182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114070 + ... + 116510.

It is an arithmetic number, because the mean of its divisors is an integer number (6813180).

Almost surely, 2^281422890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 281422890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (436043520).

281422890 is an abundant number, since it is smaller than the sum of its proper divisors (590664150).

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

281422890 is a wasteful number, since it uses less digits than its factorization.

281422890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525 (or 2519 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 281422890 is about 16775.6636232371. The cubic root of 281422890 is about 655.3195728983.

The spelling of 281422890 in words is "two hundred eighty-one million, four hundred twenty-two thousand, eight hundred ninety".