806891988 has 96 divisors (see below), whose sum is σ = 2195601408. Its totient is φ = 225878400.

The previous prime is 806891983. The next prime is 806891993. The reversal of 806891988 is 889198608.

It is an interprime number because it is at equal distance from previous prime (806891983) and next prime (806891993).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806891983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1750078 + ... + 1750538.

It is an arithmetic number, because the mean of its divisors is an integer number (22870848).

Almost surely, 2^806891988 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 806891988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097800704).

806891988 is an abundant number, since it is smaller than the sum of its proper divisors (1388709420).

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

806891988 is a wasteful number, since it uses less digits than its factorization.

806891988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853 (or 851 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 57.

The square root of 806891988 is about 28405.8442578284. The cubic root of 806891988 is about 930.9759623803.

The spelling of 806891988 in words is "eight hundred six million, eight hundred ninety-one thousand, nine hundred eighty-eight".