769487861 has 4 divisors (see below), whose sum is σ = 772848300. Its totient is φ = 766127424.

The previous prime is 769487857. The next prime is 769487879. The reversal of 769487861 is 168784967.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 730674961 + 38812900 = 27031^2 + 6230^2 .

It is a cyclic number.

It is not a de Polignac number, because 769487861 - 2² = 769487857 is a prime.

It is a super-2 number, since 2×769487861² = 1184223136452710642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 769487797 and 769487806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (769487801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1679876 + ... + 1680333.

It is an arithmetic number, because the mean of its divisors is an integer number (193212075).

Almost surely, 2^769487861 is an apocalyptic number.

It is an amenable number.

769487861 is a deficient number, since it is larger than the sum of its proper divisors (3360439).

769487861 is a wasteful number, since it uses less digits than its factorization.

769487861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360438.

The product of its digits is 4064256, while the sum is 56.

The square root of 769487861 is about 27739.6442118496. The cubic root of 769487861 is about 916.3623929993.

The spelling of 769487861 in words is "seven hundred sixty-nine million, four hundred eighty-seven thousand, eight hundred sixty-one".