2158764 has 12 divisors (see below), whose sum is σ = 5037144. Its totient is φ = 719584.

The previous prime is 2158763. The next prime is 2158769. The reversal of 2158764 is 4678512.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (2158763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89937 + ... + 89960.

It is an arithmetic number, because the mean of its divisors is an integer number (419762).

2^2158764 is an apocalyptic number.

It is an amenable number.

2158764 is an abundant number, since it is smaller than the sum of its proper divisors (2878380).

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

2158764 is a wasteful number, since it uses less digits than its factorization.

2158764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179904 (or 179902 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 2158764 is about 1469.2732897593. The cubic root of 2158764 is about 129.2414203893.

It can be divided in two parts, 21 and 58764, that added together give a palindrome (58785).

The spelling of 2158764 in words is "two million, one hundred fifty-eight thousand, seven hundred sixty-four".