767749961 has 6 divisors (see below), whose sum is σ = 843890586. Its totient is φ = 697954400.

The previous prime is 767749943. The next prime is 767749981. The reversal of 767749961 is 169947767.

It can be written as a sum of positive squares in only one way, i.e., 535644736 + 232105225 = 23144^2 + 15235^2 .

It is not a de Polignac number, because 767749961 - 2⁶ = 767749897 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 767749897 and 767749906.

It is not an unprimeable number, because it can be changed into a prime (767749981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3172400 + ... + 3172641.

It is an arithmetic number, because the mean of its divisors is an integer number (140648431).

Almost surely, 2^767749961 is an apocalyptic number.

It is an amenable number.

767749961 is a deficient number, since it is larger than the sum of its proper divisors (76140625).

767749961 is a wasteful number, since it uses less digits than its factorization.

767749961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6345063 (or 6345052 counting only the distinct ones).

The product of its digits is 4000752, while the sum is 56.

The square root of 767749961 is about 27708.3013012346. The cubic root of 767749961 is about 915.6720001982.

The spelling of 767749961 in words is "seven hundred sixty-seven million, seven hundred forty-nine thousand, nine hundred sixty-one".