661727 has 8 divisors (see below), whose sum is σ = 739200. Its totient is φ = 587160.

The previous prime is 661721. The next prime is 661741. The reversal of 661727 is 727166.

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

It is a cyclic number.

It is not a de Polignac number, because 661727 - 2⁶ = 661663 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 661727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661721) 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 7 ways as a sum of consecutive naturals, for example, 227 + ... + 1172.

It is an arithmetic number, because the mean of its divisors is an integer number (92400).

2⁶⁶¹⁷²⁷ is an apocalyptic number.

661727 is a deficient number, since it is larger than the sum of its proper divisors (77473).

661727 is a wasteful number, since it uses less digits than its factorization.

661727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453.

The product of its digits is 3528, while the sum is 29.

The square root of 661727 is about 813.4660410859. The cubic root of 661727 is about 87.1417515633.

The spelling of 661727 in words is "six hundred sixty-one thousand, seven hundred twenty-seven".