667396240 has 80 divisors (see below), whose sum is σ = 1811169792. Its totient is φ = 223944192.

The previous prime is 667396231. The next prime is 667396253. The reversal of 667396240 is 42693766.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×667396240² = 890835482332275200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13642 + ... + 38998.

Almost surely, 2^667396240 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 667396240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (905584896).

667396240 is an abundant number, since it is smaller than the sum of its proper divisors (1143773552).

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

667396240 is a wasteful number, since it uses less digits than its factorization.

667396240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25424 (or 25418 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 667396240 is about 25834.0132383647. The cubic root of 667396240 is about 873.8990190660.

The spelling of 667396240 in words is "six hundred sixty-seven million, three hundred ninety-six thousand, two hundred forty".