810642540 has 24 divisors (see below), whose sum is σ = 2269799280. Its totient is φ = 216171328.

The previous prime is 810642523. The next prime is 810642587. The reversal of 810642540 is 45246018.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 810642498 and 810642507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6755295 + ... + 6755414.

It is an arithmetic number, because the mean of its divisors is an integer number (94574970).

Almost surely, 2^810642540 is an apocalyptic number.

It is an amenable number.

810642540 is an abundant number, since it is smaller than the sum of its proper divisors (1459156740).

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

810642540 is a wasteful number, since it uses less digits than its factorization.

810642540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13510721 (or 13510719 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 810642540 is about 28471.7849809245. The cubic root of 810642540 is about 932.4161707352.

Adding to 810642540 its reverse (45246018), we get a palindrome (855888558).

The spelling of 810642540 in words is "eight hundred ten million, six hundred forty-two thousand, five hundred forty".