661088 has 24 divisors (see below), whose sum is σ = 1324008. Its totient is φ = 324864.

The previous prime is 661061. The next prime is 661091. The reversal of 661088 is 880166.

It is a self number, because there is not a number n which added to its sum of digits gives 661088.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2195 + ... + 2477.

It is an arithmetic number, because the mean of its divisors is an integer number (55167).

2⁶⁶¹⁰⁸⁸ is an apocalyptic number.

It is an amenable number.

661088 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.

661088 is a wasteful number, since it uses less digits than its factorization.

661088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 661088 is about 813.0731824381. The cubic root of 661088 is about 87.1136929063.

The spelling of 661088 in words is "six hundred sixty-one thousand, eighty-eight".