712821618 has 12 divisors (see below), whose sum is σ = 1544446878. Its totient is φ = 237607200.

The previous prime is 712821617. The next prime is 712821647. The reversal of 712821618 is 816128217.

712821618 is a `hidden beast` number, since 7 + 12 + 8 + 21 + 618 = 666.

It can be written as a sum of positive squares in only one way, i.e., 712729809 + 91809 = 26697^2 + 303^2 .

It is a super-2 number, since 2×712821618² = 1016229318176275848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (712821617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19800583 + ... + 19800618.

Almost surely, 2^712821618 is an apocalyptic number.

712821618 is an abundant number, since it is smaller than the sum of its proper divisors (831625260).

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

712821618 is a wasteful number, since it uses less digits than its factorization.

712821618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39601209 (or 39601206 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 712821618 is about 26698.7194074922. The cubic root of 712821618 is about 893.2923622642.

It can be divided in two parts, 71282 and 1618, that added together give a square (72900 = 270²).

The spelling of 712821618 in words is "seven hundred twelve million, eight hundred twenty-one thousand, six hundred eighteen".