667401340 has 24 divisors (see below), whose sum is σ = 1418432400. Its totient is φ = 263743488.

The previous prime is 667401337. The next prime is 667401341. The reversal of 667401340 is 43104766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667401341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199365 + ... + 202684.

It is an arithmetic number, because the mean of its divisors is an integer number (59101350).

Almost surely, 2^667401340 is an apocalyptic number.

It is an amenable number.

667401340 is an abundant number, since it is smaller than the sum of its proper divisors (751031060).

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

667401340 is a wasteful number, since it uses less digits than its factorization.

667401340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402141 (or 402139 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 667401340 is about 25834.1119452556. Note that the first 3 decimals coincide. The cubic root of 667401340 is about 873.9012450667.

The spelling of 667401340 in words is "six hundred sixty-seven million, four hundred one thousand, three hundred forty".