811242923540 has 144 divisors (see below), whose sum is σ = 2034970439040. Its totient is φ = 266032581120.

The previous prime is 811242923527. The next prime is 811242923549. The reversal of 811242923540 is 45329242118.

It is a super-2 number, since 2×811242923540² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811242923549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11272070 + ... + 11343810.

It is an arithmetic number, because the mean of its divisors is an integer number (14131739160).

Almost surely, 2^811242923540 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 811242923540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1017485219520).

811242923540 is an abundant number, since it is smaller than the sum of its proper divisors (1223727515500).

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

811242923540 is a wasteful number, since it uses less digits than its factorization.

811242923540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71890 (or 71851 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 811242923540 in words is "eight hundred eleven billion, two hundred forty-two million, nine hundred twenty-three thousand, five hundred forty".