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BaseRepresentation
bin10100010111100110000
31020220120000
42202330300
5132324230
622150000
75446614
oct2427460
91226500
10667440
11416504
12282300
131a4a47
14135344
15d2b60
hexa2f30

667440 has 100 divisors (see below), whose sum is σ = 2340624. Its totient is φ = 176256.

The previous prime is 667427. The next prime is 667441. The reversal of 667440 is 44766.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (667441) by changing a digit.

667440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6429 + ... + 6531.

2667440 is an apocalyptic number.

667440 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 667440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1170312).

667440 is an abundant number, since it is smaller than the sum of its proper divisors (1673184).

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

667440 is a wasteful number, since it uses less digits than its factorization.

667440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 667440 is about 816.9700116895. The cubic root of 667440 is about 87.3918118657.

The spelling of 667440 in words is "six hundred sixty-seven thousand, four hundred forty".