812387688 has 64 divisors (see below), whose sum is σ = 2383858560. Its totient is φ = 225835776.

The previous prime is 812387683. The next prime is 812387711. The reversal of 812387688 is 886783218.

It is a super-2 number, since 2×812387688² = 1319947511227970688, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 812387688.

It is not an unprimeable number, because it can be changed into a prime (812387683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59131 + ... + 71562.

It is an arithmetic number, because the mean of its divisors is an integer number (37247790).

Almost surely, 2^812387688 is an apocalyptic number.

It is an amenable number.

812387688 is an abundant number, since it is smaller than the sum of its proper divisors (1571470872).

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

812387688 is a wasteful number, since it uses less digits than its factorization.

812387688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130746 (or 130742 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 51.

The square root of 812387688 is about 28502.4154765872. The cubic root of 812387688 is about 933.0847917571.

The spelling of 812387688 in words is "eight hundred twelve million, three hundred eighty-seven thousand, six hundred eighty-eight".