661084 has 24 divisors (see below), whose sum is σ = 1234800. Its totient is φ = 309120.

The previous prime is 661061. The next prime is 661091. The reversal of 661084 is 480166.

It is a congruent number.

It is an unprimeable number.

661084 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4687 + ... + 4825.

It is an arithmetic number, because the mean of its divisors is an integer number (51450).

2⁶⁶¹⁰⁸⁴ is an apocalyptic number.

It is an amenable number.

661084 is a deficient number, since it is larger than the sum of its proper divisors (573716).

661084 is a wasteful number, since it uses less digits than its factorization.

661084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 661084 is about 813.0707226312. The cubic root of 661084 is about 87.1135172084.

The spelling of 661084 in words is "six hundred sixty-one thousand, eighty-four".