667212740 has 24 divisors (see below), whose sum is σ = 1474892160. Its totient is φ = 252838368.

The previous prime is 667212697. The next prime is 667212751. The reversal of 667212740 is 47212766.

It is a self number, because there is not a number n which added to its sum of digits gives 667212740.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 877532 + ... + 878291.

It is an arithmetic number, because the mean of its divisors is an integer number (61453840).

Almost surely, 2^667212740 is an apocalyptic number.

It is an amenable number.

667212740 is an abundant number, since it is smaller than the sum of its proper divisors (807679420).

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

667212740 is a wasteful number, since it uses less digits than its factorization.

667212740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755851 (or 1755849 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 667212740 is about 25830.4614747782. The cubic root of 667212740 is about 873.8189191395.

The spelling of 667212740 in words is "six hundred sixty-seven million, two hundred twelve thousand, seven hundred forty".