2164428 has 72 divisors (see below), whose sum is σ = 6543600. Its totient is φ = 616896.

The previous prime is 2164417. The next prime is 2164429. The reversal of 2164428 is 8244612.

2164428 is a `hidden beast` number, since 216 + 442 + 8 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (2164429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5088 + ... + 5496.

2^2164428 is an apocalyptic number.

2164428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2164428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3271800).

2164428 is an abundant number, since it is smaller than the sum of its proper divisors (4379172).

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

2164428 is a wasteful number, since it uses less digits than its factorization.

2164428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 421 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 2164428 is about 1471.1995106035. The cubic root of 2164428 is about 129.3543529328.

The spelling of 2164428 in words is "two million, one hundred sixty-four thousand, four hundred twenty-eight".