669498768 has 60 divisors (see below), whose sum is σ = 1899363180. Its totient is φ = 220105728.

The previous prime is 669498761. The next prime is 669498793. The reversal of 669498768 is 867894966.

It can be written as a sum of positive squares in 2 ways, for example, as 370485504 + 299013264 = 19248^2 + 17292^2 .

It is not an unprimeable number, because it can be changed into a prime (669498761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21333 + ... + 42356.

It is an arithmetic number, because the mean of its divisors is an integer number (31656053).

Almost surely, 2^669498768 is an apocalyptic number.

It is an amenable number.

669498768 is an abundant number, since it is smaller than the sum of its proper divisors (1229864412).

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

669498768 is a wasteful number, since it uses less digits than its factorization.

669498768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63776 (or 63767 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The square root of 669498768 is about 25874.6742588192. The cubic root of 669498768 is about 874.8157513552.

The spelling of 669498768 in words is "six hundred sixty-nine million, four hundred ninety-eight thousand, seven hundred sixty-eight".