660774 has 8 divisors (see below), whose sum is σ = 1321560. Its totient is φ = 220256.

The previous prime is 660769. The next prime is 660787. The reversal of 660774 is 477066.

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

660774 is an admirable number.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660774.

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, 55059 + ... + 55070.

It is an arithmetic number, because the mean of its divisors is an integer number (165195).

2⁶⁶⁰⁷⁷⁴ is an apocalyptic number.

660774 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

660774 is a wasteful number, since it uses less digits than its factorization.

660774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110134.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 660774 is about 812.8800649542. The cubic root of 660774 is about 87.0998984587.

The spelling of 660774 in words is "six hundred sixty thousand, seven hundred seventy-four".