1145664 has 140 divisors (see below), whose sum is σ = 3872484. Its totient is φ = 331776.

The previous prime is 1145659. The next prime is 1145689. The reversal of 1145664 is 4665411.

It can be written as a sum of positive squares in 2 ways, for example, as 518400 + 627264 = 720^2 + 792^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 67384 + ... + 67400.

2^1145664 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 1145664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1936242).

1145664 is an abundant number, since it is smaller than the sum of its proper divisors (2726820).

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

1145664 is a wasteful number, since it uses less digits than its factorization.

1145664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54 (or 35 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1145664 is about 1070.3569498069. The cubic root of 1145664 is about 104.6371146414.

It can be divided in two parts, 114 and 5664, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 1145664 in words is "one million, one hundred forty-five thousand, six hundred sixty-four".