810142736440 has 64 divisors (see below), whose sum is σ = 1829408716800. Its totient is φ = 322886919168.

The previous prime is 810142736407. The next prime is 810142736449. The reversal of 810142736440 is 44637241018.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 810142736393 and 810142736402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810142736449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30126921 + ... + 30153799.

It is an arithmetic number, because the mean of its divisors is an integer number (28584511200).

Almost surely, 2^810142736440 is an apocalyptic number.

It is an amenable number.

810142736440 is an abundant number, since it is smaller than the sum of its proper divisors (1019265980360).

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

810142736440 is a wasteful number, since it uses less digits than its factorization.

810142736440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29584 (or 29580 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

Adding to 810142736440 its reverse (44637241018), we get a palindrome (854779977458).

The spelling of 810142736440 in words is "eight hundred ten billion, one hundred forty-two million, seven hundred thirty-six thousand, four hundred forty".