810538491000 has 512 divisors, whose sum is σ = 2956298342400. Its totient is φ = 181072281600.

The previous prime is 810538490981. The next prime is 810538491017. The reversal of 810538491000 is 194835018.

It is a self number, because there is not a number n which added to its sum of digits gives 810538491000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 173226661 + ... + 173231339.

It is an arithmetic number, because the mean of its divisors is an integer number (5774020200).

Almost surely, 2^810538491000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 810538491000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1478149171200).

810538491000 is an abundant number, since it is smaller than the sum of its proper divisors (2145759851400).

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

810538491000 is a wasteful number, since it uses less digits than its factorization.

810538491000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4896 (or 4882 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 810538491000 in words is "eight hundred ten billion, five hundred thirty-eight million, four hundred ninety-one thousand".