669978290 has 8 divisors (see below), whose sum is σ = 1205960940. Its totient is φ = 267991312.

The previous prime is 669978263. The next prime is 669978317. The reversal of 669978290 is 92879966.

It is an interprime number because it is at equal distance from previous prime (669978263) and next prime (669978317).

It can be written as a sum of positive squares in 2 ways, for example, as 662908009 + 7070281 = 25747^2 + 2659^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33498905 + ... + 33498924.

Almost surely, 2^669978290 is an apocalyptic number.

669978290 is a deficient number, since it is larger than the sum of its proper divisors (535982650).

669978290 is a wasteful number, since it uses less digits than its factorization.

669978290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66997836.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The square root of 669978290 is about 25883.9388424560. The cubic root of 669978290 is about 875.0245609432.

The spelling of 669978290 in words is "six hundred sixty-nine million, nine hundred seventy-eight thousand, two hundred ninety".