665378 has 8 divisors (see below), whose sum is σ = 1140672. Its totient is φ = 285156.

The previous prime is 665369. The next prime is 665381. The reversal of 665378 is 873566.

It is a happy number.

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

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23750 + ... + 23777.

It is an arithmetic number, because the mean of its divisors is an integer number (142584).

2⁶⁶⁵³⁷⁸ is an apocalyptic number.

665378 is a deficient number, since it is larger than the sum of its proper divisors (475294).

665378 is a wasteful number, since it uses less digits than its factorization.

665378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47536.

The product of its digits is 30240, while the sum is 35.

The square root of 665378 is about 815.7070552594. The cubic root of 665378 is about 87.3017224653.

The spelling of 665378 in words is "six hundred sixty-five thousand, three hundred seventy-eight".