1161664 has 28 divisors (see below), whose sum is σ = 2635504. Its totient is φ = 497664.

The previous prime is 1161659. The next prime is 1161683. The reversal of 1161664 is 4661611.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

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, 849 + ... + 1744.

2^1161664 is an apocalyptic number.

1161664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1161664 is an abundant number, since it is smaller than the sum of its proper divisors (1473840).

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

1161664 is an equidigital number, since it uses as much as digits as its factorization.

1161664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2612 (or 2602 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 1161664 is about 1077.8051772004. The cubic root of 1161664 is about 105.1219746538.

The spelling of 1161664 in words is "one million, one hundred sixty-one thousand, six hundred sixty-four".