810399768 has 96 divisors (see below), whose sum is σ = 2147024880. Its totient is φ = 254745600.

The previous prime is 810399763. The next prime is 810399781. The reversal of 810399768 is 867993018.

It is a self number, because there is not a number n which added to its sum of digits gives 810399768.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810399763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 945196 + ... + 946052.

Almost surely, 2^810399768 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 810399768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1073512440).

810399768 is an abundant number, since it is smaller than the sum of its proper divisors (1336625112).

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

810399768 is a wasteful number, since it uses less digits than its factorization.

810399768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 810399768 is about 28467.5212830341. The cubic root of 810399768 is about 932.3230811474.

The spelling of 810399768 in words is "eight hundred ten million, three hundred ninety-nine thousand, seven hundred sixty-eight".