669617460 has 72 divisors (see below), whose sum is σ = 2074415616. Its totient is φ = 174763200.

The previous prime is 669617447. The next prime is 669617461. The reversal of 669617460 is 64716966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669617461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31116 + ... + 48035.

It is an arithmetic number, because the mean of its divisors is an integer number (28811328).

Almost surely, 2^669617460 is an apocalyptic number.

669617460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669617460 is an abundant number, since it is smaller than the sum of its proper divisors (1404798156).

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

669617460 is a wasteful number, since it uses less digits than its factorization.

669617460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79213 (or 79208 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 669617460 is about 25876.9677512648. The cubic root of 669617460 is about 874.8674454985.

The spelling of 669617460 in words is "six hundred sixty-nine million, six hundred seventeen thousand, four hundred sixty".