812644618 has 8 divisors (see below), whose sum is σ = 1219414212. Its totient is φ = 406173216.

The previous prime is 812644607. The next prime is 812644621. The reversal of 812644618 is 816446218.

It can be written as a sum of positive squares in 2 ways, for example, as 802192329 + 10452289 = 28323^2 + 3233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67605 + ... + 78712.

Almost surely, 2^812644618 is an apocalyptic number.

812644618 is a deficient number, since it is larger than the sum of its proper divisors (406769594).

812644618 is a wasteful number, since it uses less digits than its factorization.

812644618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149096.

The product of its digits is 73728, while the sum is 40.

The square root of 812644618 is about 28506.9222821405. The cubic root of 812644618 is about 933.1831488223.

The spelling of 812644618 in words is "eight hundred twelve million, six hundred forty-four thousand, six hundred eighteen".