817126830 has 144 divisors (see below), whose sum is σ = 2376107136. Its totient is φ = 194538240.

The previous prime is 817126801. The next prime is 817126847. The reversal of 817126830 is 38621718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 470644 + ... + 472376.

It is an arithmetic number, because the mean of its divisors is an integer number (16500744).

Almost surely, 2^817126830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 817126830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1188053568).

817126830 is an abundant number, since it is smaller than the sum of its proper divisors (1558980306).

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

817126830 is a wasteful number, since it uses less digits than its factorization.

817126830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803 (or 1787 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 817126830 is about 28585.4303798281. The cubic root of 817126830 is about 934.8956883640.

The spelling of 817126830 in words is "eight hundred seventeen million, one hundred twenty-six thousand, eight hundred thirty".