810043440 has 160 divisors (see below), whose sum is σ = 2635117056. Its totient is φ = 205455360.

The previous prime is 810043439. The next prime is 810043441. The reversal of 810043440 is 44340018.

It is an interprime number because it is at equal distance from previous prime (810043439) and next prime (810043441).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 810043440.

It is not an unprimeable number, because it can be changed into a prime (810043441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1418355 + ... + 1418925.

Almost surely, 2^810043440 is an apocalyptic number.

810043440 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 810043440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317558528).

810043440 is an abundant number, since it is smaller than the sum of its proper divisors (1825073616).

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

810043440 is a wasteful number, since it uses less digits than its factorization.

810043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 810043440 is about 28461.2620942923. The cubic root of 810043440 is about 932.1864154611.

Adding to 810043440 its reverse (44340018), we get a palindrome (854383458).

The spelling of 810043440 in words is "eight hundred ten million, forty-three thousand, four hundred forty".