818191952 has 80 divisors (see below), whose sum is σ = 1683173520. Its totient is φ = 384823296.

The previous prime is 818191943. The next prime is 818191991. The reversal of 818191952 is 259191818.

It can be written as a sum of positive squares in 8 ways, for example, as 155850256 + 662341696 = 12484^2 + 25736^2 .

Its product of digits (51840) is a multiple of the sum of its prime factors (480).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2792318 + ... + 2792610.

It is an arithmetic number, because the mean of its divisors is an integer number (21039669).

Almost surely, 2^818191952 is an apocalyptic number.

It is an amenable number.

818191952 is an abundant number, since it is smaller than the sum of its proper divisors (864981568).

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

818191952 is a wasteful number, since it uses less digits than its factorization.

818191952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 474 counting only the distinct ones).

The product of its digits is 51840, while the sum is 44.

The square root of 818191952 is about 28604.0548174555. The cubic root of 818191952 is about 935.3017230935.

The spelling of 818191952 in words is "eight hundred eighteen million, one hundred ninety-one thousand, nine hundred fifty-two".