667240440 has 128 divisors (see below), whose sum is σ = 2065132800. Its totient is φ = 172385280.

The previous prime is 667240397. The next prime is 667240477. The reversal of 667240440 is 44042766.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 516195 + ... + 517485.

It is an arithmetic number, because the mean of its divisors is an integer number (16133850).

Almost surely, 2^667240440 is an apocalyptic number.

667240440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667240440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1032566400).

667240440 is an abundant number, since it is smaller than the sum of its proper divisors (1397892360).

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

667240440 is a wasteful number, since it uses less digits than its factorization.

667240440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437 (or 1433 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 667240440 is about 25830.9976578529. The cubic root of 667240440 is about 873.8310114591.

The spelling of 667240440 in words is "six hundred sixty-seven million, two hundred forty thousand, four hundred forty".