810040761 has 12 divisors (see below), whose sum is σ = 1171590420. Its totient is φ = 539320320.

The previous prime is 810040753. The next prime is 810040771. The reversal of 810040761 is 167040018.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 385886736 + 424154025 = 19644^2 + 20595^2 .

It is not a de Polignac number, because 810040761 - 2³ = 810040753 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (810040771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51600 + ... + 65441.

It is an arithmetic number, because the mean of its divisors is an integer number (97632535).

Almost surely, 2^810040761 is an apocalyptic number.

It is an amenable number.

810040761 is a deficient number, since it is larger than the sum of its proper divisors (361549659).

810040761 is a wasteful number, since it uses less digits than its factorization.

810040761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117816 (or 117813 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 810040761 is about 28461.2150302829. The cubic root of 810040761 is about 932.1853878083.

Adding to 810040761 its reverse (167040018), we get a palindrome (977080779).

The spelling of 810040761 in words is "eight hundred ten million, forty thousand, seven hundred sixty-one".