667995 has 8 divisors (see below), whose sum is σ = 1068816. Its totient is φ = 356256.

The previous prime is 667991. The next prime is 667999. The reversal of 667995 is 599766.

667995 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (667991) and next prime (667999).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 667995 - 2² = 667991 is a prime.

667995 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (667991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22252 + ... + 22281.

It is an arithmetic number, because the mean of its divisors is an integer number (133602).

2⁶⁶⁷⁹⁹⁵ is an apocalyptic number.

667995 is a deficient number, since it is larger than the sum of its proper divisors (400821).

667995 is a wasteful number, since it uses less digits than its factorization.

667995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44541.

The product of its digits is 102060, while the sum is 42.

The square root of 667995 is about 817.3096108575. The cubic root of 667995 is about 87.4160282836.

The spelling of 667995 in words is "six hundred sixty-seven thousand, nine hundred ninety-five".