810881439438 has 16 divisors (see below), whose sum is σ = 1853443290240. Its totient is φ = 231680411256.

The previous prime is 810881439413. The next prime is 810881439439. The reversal of 810881439438 is 834934188018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810881439439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9653350428 + ... + 9653350511.

It is an arithmetic number, because the mean of its divisors is an integer number (115840205640).

Almost surely, 2^810881439438 is an apocalyptic number.

810881439438 is an abundant number, since it is smaller than the sum of its proper divisors (1042561850802).

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

810881439438 is a wasteful number, since it uses less digits than its factorization.

810881439438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19306700951.

The product of its (nonzero) digits is 5308416, while the sum is 57.

The spelling of 810881439438 in words is "eight hundred ten billion, eight hundred eighty-one million, four hundred thirty-nine thousand, four hundred thirty-eight".