669291780 has 24 divisors (see below), whose sum is σ = 1874017152. Its totient is φ = 178477792.

The previous prime is 669291731. The next prime is 669291781. The reversal of 669291780 is 87192966.

It is not an unprimeable number, because it can be changed into a prime (669291781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5577372 + ... + 5577491.

It is an arithmetic number, because the mean of its divisors is an integer number (78084048).

Almost surely, 2^669291780 is an apocalyptic number.

669291780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669291780 is an abundant number, since it is smaller than the sum of its proper divisors (1204725372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669291780 is a wasteful number, since it uses less digits than its factorization.

669291780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11154875 (or 11154873 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 669291780 is about 25870.6741311470. The cubic root of 669291780 is about 874.7255868741.

The spelling of 669291780 in words is "six hundred sixty-nine million, two hundred ninety-one thousand, seven hundred eighty".