766889 has 4 divisors (see below), whose sum is σ = 800256. Its totient is φ = 733524.

The previous prime is 766877. The next prime is 766891. The reversal of 766889 is 988667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 988667 = 773 ⋅1279.

It is a cyclic number.

It is not a de Polignac number, because 766889 - 2⁴ = 766873 is a prime.

It is a super-3 number, since 3×766889³ = 1353065373336760107, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (765889) 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, 16649 + ... + 16694.

It is an arithmetic number, because the mean of its divisors is an integer number (200064).

2⁷⁶⁶⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

766889 is a deficient number, since it is larger than the sum of its proper divisors (33367).

766889 is a wasteful number, since it uses less digits than its factorization.

766889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33366.

The product of its digits is 145152, while the sum is 44.

The square root of 766889 is about 875.7219878477. The cubic root of 766889 is about 91.5329591517.

The spelling of 766889 in words is "seven hundred sixty-six thousand, eight hundred eighty-nine".