813722490 has 128 divisors (see below), whose sum is σ = 2540643840. Its totient is φ = 181440000.

The previous prime is 813722477. The next prime is 813722593. The reversal of 813722490 is 94227318.

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 63 ways as a sum of consecutive naturals, for example, 72240 + ... + 82740.

It is an arithmetic number, because the mean of its divisors is an integer number (19848780).

Almost surely, 2^813722490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 813722490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1270321920).

813722490 is an abundant number, since it is smaller than the sum of its proper divisors (1726921350).

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

813722490 is a wasteful number, since it uses less digits than its factorization.

813722490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10565 (or 10559 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 813722490 is about 28525.8214605645. The cubic root of 813722490 is about 933.5955503320.

The spelling of 813722490 in words is "eight hundred thirteen million, seven hundred twenty-two thousand, four hundred ninety".