669624690 has 48 divisors (see below), whose sum is σ = 1869486912. Its totient is φ = 153056736.

The previous prime is 669624677. The next prime is 669624719. The reversal of 669624690 is 96426966.

It is a happy number.

It is a super-2 number, since 2×669624690² = 896794450915192200, which contains 22 as substring.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 226294 + ... + 229233.

It is an arithmetic number, because the mean of its divisors is an integer number (38947644).

Almost surely, 2^669624690 is an apocalyptic number.

669624690 is an abundant number, since it is smaller than the sum of its proper divisors (1199862222).

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

669624690 is a wasteful number, since it uses less digits than its factorization.

669624690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455551 (or 455544 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 48.

The square root of 669624690 is about 25877.1074504087. The cubic root of 669624690 is about 874.8705941961.

The spelling of 669624690 in words is "six hundred sixty-nine million, six hundred twenty-four thousand, six hundred ninety".