667171840 has 44 divisors (see below), whose sum is σ = 1600442856. Its totient is φ = 266866688.

The previous prime is 667171819. The next prime is 667171849. The reversal of 667171840 is 48171766.

It is a super-3 number, since 3×667171840³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 667171793 and 667171802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667171849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60034 + ... + 70273.

Almost surely, 2^667171840 is an apocalyptic number.

It is an amenable number.

667171840 is an abundant number, since it is smaller than the sum of its proper divisors (933271016).

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

667171840 is a wasteful number, since it uses less digits than its factorization.

667171840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130332 (or 130314 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 667171840 is about 25829.6697617294. The cubic root of 667171840 is about 873.8010638029.

The spelling of 667171840 in words is "six hundred sixty-seven million, one hundred seventy-one thousand, eight hundred forty".