669720600 has 72 divisors (see below), whose sum is σ = 2249151060. Its totient is φ = 178591680.

The previous prime is 669720599. The next prime is 669720613. The reversal of 669720600 is 6027966.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 184234 + ... + 187833.

Almost surely, 2^669720600 is an apocalyptic number.

669720600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669720600 is an abundant number, since it is smaller than the sum of its proper divisors (1579430460).

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

669720600 is a wasteful number, since it uses less digits than its factorization.

669720600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372089 (or 372077 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 669720600 is about 25878.9605664524. The cubic root of 669720600 is about 874.9123612906.

The spelling of 669720600 in words is "six hundred sixty-nine million, seven hundred twenty thousand, six hundred".