669763688 has 32 divisors (see below), whose sum is σ = 1450560960. Its totient is φ = 286529280.

The previous prime is 669763681. The next prime is 669763697. The reversal of 669763688 is 886367966.

It is a super-2 number, since 2×669763688² = 897166795526722688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (669763681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222356 + ... + 225347.

It is an arithmetic number, because the mean of its divisors is an integer number (45330030).

Almost surely, 2^669763688 is an apocalyptic number.

669763688 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

669763688 is an abundant number, since it is smaller than the sum of its proper divisors (780797272).

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

669763688 is a wasteful number, since it uses less digits than its factorization.

669763688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447737 (or 447733 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 59.

The square root of 669763688 is about 25879.7930439948. The cubic root of 669763688 is about 874.9311240479.

The spelling of 669763688 in words is "six hundred sixty-nine million, seven hundred sixty-three thousand, six hundred eighty-eight".