812187699840 has 1280 divisors, whose sum is σ = 3252363840000. Its totient is φ = 193096949760.

The previous prime is 812187699797. The next prime is 812187699863. The reversal of 812187699840 is 48996781218.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 5450924086 + ... + 5450924234.

It is an arithmetic number, because the mean of its divisors is an integer number (2540909250).

Almost surely, 2^812187699840 is an apocalyptic number.

812187699840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812187699840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1626181920000).

812187699840 is an abundant number, since it is smaller than the sum of its proper divisors (2440176140160).

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

812187699840 is a wasteful number, since it uses less digits than its factorization.

812187699840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 63.

The spelling of 812187699840 in words is "eight hundred twelve billion, one hundred eighty-seven million, six hundred ninety-nine thousand, eight hundred forty".