669491782 has 8 divisors (see below), whose sum is σ = 1025604576. Its totient is φ = 327623592.

The previous prime is 669491761. The next prime is 669491783. The reversal of 669491782 is 287194966.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669491783) 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, 3561033 + ... + 3561220.

It is an arithmetic number, because the mean of its divisors is an integer number (128200572).

Almost surely, 2^669491782 is an apocalyptic number.

669491782 is a deficient number, since it is larger than the sum of its proper divisors (356112794).

669491782 is a wasteful number, since it uses less digits than its factorization.

669491782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7122302.

The product of its digits is 1306368, while the sum is 52.

The square root of 669491782 is about 25874.5392615985. The cubic root of 669491782 is about 874.8127085395.

The spelling of 669491782 in words is "six hundred sixty-nine million, four hundred ninety-one thousand, seven hundred eighty-two".