840064761 has 12 divisors (see below), whose sum is σ = 1246222692. Its totient is φ = 544906656.

The previous prime is 840064759. The next prime is 840064781. The reversal of 840064761 is 167460048.

840064761 is a `hidden beast` number, since 8 + 4 + 0 + 0 + 647 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 584672400 + 255392361 = 24180^2 + 15981^2 .

It is not a de Polignac number, because 840064761 - 2¹ = 840064759 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (840064751) 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, 1261026 + ... + 1261691.

It is an arithmetic number, because the mean of its divisors is an integer number (103851891).

Almost surely, 2^840064761 is an apocalyptic number.

It is an amenable number.

840064761 is a deficient number, since it is larger than the sum of its proper divisors (406157931).

840064761 is a wasteful number, since it uses less digits than its factorization.

840064761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2522760 (or 2522757 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 840064761 is about 28983.8707042382. The cubic root of 840064761 is about 943.5630432640.

The spelling of 840064761 in words is "eight hundred forty million, sixty-four thousand, seven hundred sixty-one".