766649 has 8 divisors (see below), whose sum is σ = 874440. Its totient is φ = 665856.

The previous prime is 766639. The next prime is 766651. The reversal of 766649 is 946667.

It can be written as a sum of positive squares in 4 ways, for example, as 1024 + 765625 = 32^2 + 875^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 766649 - 2⁸ = 766393 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 766649.

It is not an unprimeable number, because it can be changed into a prime (766609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1514 + ... + 1955.

It is an arithmetic number, because the mean of its divisors is an integer number (109305).

2⁷⁶⁶⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

766649 is a deficient number, since it is larger than the sum of its proper divisors (107791).

766649 is a wasteful number, since it uses less digits than its factorization.

766649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499.

The product of its digits is 54432, while the sum is 38.

The square root of 766649 is about 875.5849473352. The cubic root of 766649 is about 91.5234096592.

Subtracting from 766649 its product of digits (54432), we obtain a palindrome (712217).

The spelling of 766649 in words is "seven hundred sixty-six thousand, six hundred forty-nine".