806421798756 has 240 divisors, whose sum is σ = 2437892481024. Its totient is φ = 227682477504.

The previous prime is 806421798739. The next prime is 806421798781. The reversal of 806421798756 is 657897124608.

806421798756 is a `hidden beast` number, since 80 + 6 + 421 + 7 + 9 + 87 + 56 = 666.

It is a super-2 number, since 2×806421798756² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 806421798693 and 806421798702.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 117499381 + ... + 117506243.

Almost surely, 2^806421798756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 806421798756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1218946240512).

806421798756 is an abundant number, since it is smaller than the sum of its proper divisors (1631470682268).

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

806421798756 is a wasteful number, since it uses less digits than its factorization.

806421798756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7492 (or 7481 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 806421798756 in words is "eight hundred six billion, four hundred twenty-one million, seven hundred ninety-eight thousand, seven hundred fifty-six".