766642 has 4 divisors (see below), whose sum is σ = 1149966. Its totient is φ = 383320.

The previous prime is 766639. The next prime is 766651. The reversal of 766642 is 246667.

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

It can be written as a sum of positive squares in only one way, i.e., 505521 + 261121 = 711^2 + 511^2 .

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191659 + ... + 191662.

2⁷⁶⁶⁶⁴² is an apocalyptic number.

766642 is a deficient number, since it is larger than the sum of its proper divisors (383324).

766642 is a wasteful number, since it uses less digits than its factorization.

766642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383323.

The product of its digits is 12096, while the sum is 31.

The square root of 766642 is about 875.5809499983. The cubic root of 766642 is about 91.5231311024.

The spelling of 766642 in words is "seven hundred sixty-six thousand, six hundred forty-two".