669427398 has 24 divisors (see below), whose sum is σ = 1452277008. Its totient is φ = 222857712.

The previous prime is 669427391. The next prime is 669427403. The reversal of 669427398 is 893724966.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669427391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8986 + ... + 37677.

It is an arithmetic number, because the mean of its divisors is an integer number (60511542).

Almost surely, 2^669427398 is an apocalyptic number.

669427398 is an abundant number, since it is smaller than the sum of its proper divisors (782849610).

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

669427398 is a wasteful number, since it uses less digits than its factorization.

669427398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47468 (or 47465 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 669427398 is about 25873.2950742653. The cubic root of 669427398 is about 874.7846645074.

The spelling of 669427398 in words is "six hundred sixty-nine million, four hundred twenty-seven thousand, three hundred ninety-eight".