812311029840 has 40 divisors (see below), whose sum is σ = 2518164193248. Its totient is φ = 216616274560.

The previous prime is 812311029797. The next prime is 812311029853. The reversal of 812311029840 is 48920113218.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 1692314406 + ... + 1692314885.

Almost surely, 2^812311029840 is an apocalyptic number.

812311029840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

812311029840 is an abundant number, since it is smaller than the sum of its proper divisors (1705853163408).

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

812311029840 is a wasteful number, since it uses less digits than its factorization.

812311029840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3384629307 (or 3384629301 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The spelling of 812311029840 in words is "eight hundred twelve billion, three hundred eleven million, twenty-nine thousand, eight hundred forty".