667212056 has 64 divisors (see below), whose sum is σ = 1593561600. Its totient is φ = 254956032.

The previous prime is 667212031. The next prime is 667212059. The reversal of 667212056 is 650212766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667212059) 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, 356 + ... + 36531.

It is an arithmetic number, because the mean of its divisors is an integer number (24899400).

Almost surely, 2^667212056 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 667212056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (796780800).

667212056 is an abundant number, since it is smaller than the sum of its proper divisors (926349544).

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

667212056 is a wasteful number, since it uses less digits than its factorization.

667212056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36936 (or 36932 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 667212056 is about 25830.4482345932. The cubic root of 667212056 is about 873.8186205379.

The spelling of 667212056 in words is "six hundred sixty-seven million, two hundred twelve thousand, fifty-six".