810897920 has 160 divisors (see below), whose sum is σ = 2283925248. Its totient is φ = 270286848.

The previous prime is 810897917. The next prime is 810897929. The reversal of 810897920 is 29798018.

It is a tau number, because it is divible by the number of its divisors (160).

It is not an unprimeable number, because it can be changed into a prime (810897929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 662429 + ... + 663651.

Almost surely, 2^810897920 is an apocalyptic number.

810897920 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 810897920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1141962624).

810897920 is an abundant number, since it is smaller than the sum of its proper divisors (1473027328).

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

810897920 is a wasteful number, since it uses less digits than its factorization.

810897920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290 (or 1274 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 810897920 is about 28476.2694185878. The cubic root of 810897920 is about 932.5140747348.

The spelling of 810897920 in words is "eight hundred ten million, eight hundred ninety-seven thousand, nine hundred twenty".