769747561 has 16 divisors (see below), whose sum is σ = 859481280. Its totient is φ = 683499520.

The previous prime is 769747549. The next prime is 769747579. The reversal of 769747561 is 165747967.

It is not a de Polignac number, because 769747561 - 2¹⁵ = 769714793 is a prime.

It is a super-2 number, since 2×769747561² = 1185022615330897442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 769747499 and 769747508.

It is not an unprimeable number, because it can be changed into a prime (769747501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76521 + ... + 85993.

It is an arithmetic number, because the mean of its divisors is an integer number (53717580).

Almost surely, 2^769747561 is an apocalyptic number.

It is an amenable number.

769747561 is a deficient number, since it is larger than the sum of its proper divisors (89733719).

769747561 is a wasteful number, since it uses less digits than its factorization.

769747561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9656.

The product of its digits is 2222640, while the sum is 52.

The square root of 769747561 is about 27744.3248431098. The cubic root of 769747561 is about 916.4654713184.

The spelling of 769747561 in words is "seven hundred sixty-nine million, seven hundred forty-seven thousand, five hundred sixty-one".