810494001440 has 72 divisors (see below), whose sum is σ = 1917914624892. Its totient is φ = 323669772800.

The previous prime is 810494001419. The next prime is 810494001497. The reversal of 810494001440 is 44100494018.

It can be written as a sum of positive squares in 2 ways, for example, as 733811530384 + 76682471056 = 856628^2 + 276916^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 810494001440.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66971390 + ... + 66983490.

Almost surely, 2^810494001440 is an apocalyptic number.

810494001440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

810494001440 is an abundant number, since it is smaller than the sum of its proper divisors (1107420623452).

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

810494001440 is an equidigital number, since it uses as much as digits as its factorization.

810494001440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13410 (or 12755 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

Adding to 810494001440 its reverse (44100494018), we get a palindrome (854594495458).

The spelling of 810494001440 in words is "eight hundred ten billion, four hundred ninety-four million, one thousand, four hundred forty".