2164780 has 24 divisors (see below), whose sum is σ = 4814208. Its totient is φ = 814848.

The previous prime is 2164739. The next prime is 2164787. The reversal of 2164780 is 874612.

It is a d-powerful number, because it can be written as 2¹¹ + 1 + 6² + 4⁸ + 7 + 8⁷ + 0 .

It is not an unprimeable number, because it can be changed into a prime (2164787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2844 + ... + 3523.

It is an arithmetic number, because the mean of its divisors is an integer number (200592).

2^2164780 is an apocalyptic number.

2164780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2164780 is an abundant number, since it is smaller than the sum of its proper divisors (2649428).

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

2164780 is a wasteful number, since it uses less digits than its factorization.

2164780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393 (or 6391 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 2164780 is about 1471.3191360137. The cubic root of 2164780 is about 129.3613648337.

The spelling of 2164780 in words is "two million, one hundred sixty-four thousand, seven hundred eighty".