1661088 has 96 divisors (see below), whose sum is σ = 5164992. Its totient is φ = 464640.

The previous prime is 1661069. The next prime is 1661111. The reversal of 1661088 is 8801661.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127770 + ... + 127782.

It is an arithmetic number, because the mean of its divisors is an integer number (53802).

2^1661088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2582496).

1661088 is an abundant number, since it is smaller than the sum of its proper divisors (3503904).

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

1661088 is a wasteful number, since it uses less digits than its factorization.

1661088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59 (or 29 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1661088 is about 1288.8320293972. The cubic root of 1661088 is about 118.4306774659.

The spelling of 1661088 in words is "one million, six hundred sixty-one thousand, eighty-eight".