806605787988 has 1440 divisors, whose sum is σ = 3034634093568. Its totient is φ = 183414067200.

The previous prime is 806605787969. The next prime is 806605788007. The reversal of 806605787988 is 889787506608.

806605787988 is a `hidden beast` number, since 8 + 0 + 6 + 605 + 7 + 8 + 7 + 9 + 8 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (806605787969) and next prime (806605788007).

It is a super-2 number, since 2×806605787988² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 479 ways as a sum of consecutive naturals, for example, 5137616406 + ... + 5137616562.

Almost surely, 2^806605787988 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 806605787988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1517317046784).

806605787988 is an abundant number, since it is smaller than the sum of its proper divisors (2228028305580).

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

806605787988 is a wasteful number, since it uses less digits than its factorization.

806605787988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 325140480, while the sum is 72.

The spelling of 806605787988 in words is "eight hundred six billion, six hundred five million, seven hundred eighty-seven thousand, nine hundred eighty-eight".