722281808 has 40 divisors (see below), whose sum is σ = 1483759200. Its totient is φ = 339652224.

The previous prime is 722281799. The next prime is 722281817. The reversal of 722281808 is 808182227.

It is an interprime number because it is at equal distance from previous prime (722281799) and next prime (722281817).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33710 + ... + 50802.

It is an arithmetic number, because the mean of its divisors is an integer number (37093980).

Almost surely, 2^722281808 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 722281808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741879600).

722281808 is an abundant number, since it is smaller than the sum of its proper divisors (761477392).

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

722281808 is a wasteful number, since it uses less digits than its factorization.

722281808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17259 (or 17253 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 722281808 is about 26875.3010773833. The cubic root of 722281808 is about 897.2267754060.

The spelling of 722281808 in words is "seven hundred twenty-two million, two hundred eighty-one thousand, eight hundred eight".