810964639640 has 32 divisors (see below), whose sum is σ = 1825878166560. Its totient is φ = 324171148800.

The previous prime is 810964639633. The next prime is 810964639643. The reversal of 810964639640 is 46936469018.

It is a happy number.

810964639640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810964639643) 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, 6648401 + ... + 6769280.

It is an arithmetic number, because the mean of its divisors is an integer number (57058692705).

Almost surely, 2^810964639640 is an apocalyptic number.

It is an amenable number.

810964639640 is an abundant number, since it is smaller than the sum of its proper divisors (1014913526920).

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

810964639640 is a wasteful number, since it uses less digits than its factorization.

810964639640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13419203 (or 13419199 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 56.

The spelling of 810964639640 in words is "eight hundred ten billion, nine hundred sixty-four million, six hundred thirty-nine thousand, six hundred forty".