667533312 has 150 divisors (see below), whose sum is σ = 1998262728. Its totient is φ = 222068736.

The previous prime is 667533299. The next prime is 667533319. The reversal of 667533312 is 213335766.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667533319) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1326853 + ... + 1327355.

Almost surely, 2^667533312 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 667533312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999131364).

667533312 is an abundant number, since it is smaller than the sum of its proper divisors (1330729416).

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

667533312 is an frugal number, since it uses more digits than its factorization.

667533312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 508 counting only the distinct ones).

The product of its digits is 68040, while the sum is 36.

The square root of 667533312 is about 25836.6660387907. Note that the first 3 decimals coincide. The cubic root of 667533312 is about 873.9588430403.

The spelling of 667533312 in words is "six hundred sixty-seven million, five hundred thirty-three thousand, three hundred twelve".