812233640 has 32 divisors (see below), whose sum is σ = 1828845000. Its totient is φ = 324658944.

The previous prime is 812233637. The next prime is 812233663. The reversal of 812233640 is 46332218.

It can be written as a sum of positive squares in 4 ways, for example, as 549339844 + 262893796 = 23438^2 + 16214^2 .

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, 55406 + ... + 68514.

Almost surely, 2^812233640 is an apocalyptic number.

It is an amenable number.

812233640 is an abundant number, since it is smaller than the sum of its proper divisors (1016611360).

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

812233640 is a wasteful number, since it uses less digits than its factorization.

812233640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14669 (or 14665 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 812233640 is about 28499.7129810109. The cubic root of 812233640 is about 933.0258096830.

Adding to 812233640 its reverse (46332218), we get a palindrome (858565858).

The spelling of 812233640 in words is "eight hundred twelve million, two hundred thirty-three thousand, six hundred forty".