667545580 has 48 divisors (see below), whose sum is σ = 1530404064. Its totient is φ = 243095040.

The previous prime is 667545523. The next prime is 667545587. The reversal of 667545580 is 85545766.

It is a self number, because there is not a number n which added to its sum of digits gives 667545580.

It is not an unprimeable number, because it can be changed into a prime (667545587) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1395 + ... + 36565.

It is an arithmetic number, because the mean of its divisors is an integer number (31883418).

Almost surely, 2^667545580 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667545580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (765202032).

667545580 is an abundant number, since it is smaller than the sum of its proper divisors (862858484).

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

667545580 is a wasteful number, since it uses less digits than its factorization.

667545580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35266 (or 35264 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 46.

The square root of 667545580 is about 25836.9034522328. The cubic root of 667545580 is about 873.9641969111.

The spelling of 667545580 in words is "six hundred sixty-seven million, five hundred forty-five thousand, five hundred eighty".