812666652 has 96 divisors (see below), whose sum is σ = 2249856000. Its totient is φ = 223383552.

The previous prime is 812666641. The next prime is 812666653. The reversal of 812666652 is 256666218.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812666653) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1093393 + ... + 1094135.

It is an arithmetic number, because the mean of its divisors is an integer number (23436000).

Almost surely, 2^812666652 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 812666652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1124928000).

812666652 is an abundant number, since it is smaller than the sum of its proper divisors (1437189348).

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

812666652 is a wasteful number, since it uses less digits than its factorization.

812666652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235 (or 1233 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 812666652 is about 28507.3087470564. The cubic root of 812666652 is about 933.1915828377.

It can be divided in two parts, 812666 and 652, that added together give a palindrome (813318).

The spelling of 812666652 in words is "eight hundred twelve million, six hundred sixty-six thousand, six hundred fifty-two".