2161628 has 12 divisors (see below), whose sum is σ = 4323312. Its totient is φ = 926400.

The previous prime is 2161613. The next prime is 2161633. The reversal of 2161628 is 8261612.

2161628 is an admirable number.

It is a super-2 number, since 2×2161628² = 9345271220768, which contains 22 as substring.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2161597 and 2161606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38573 + ... + 38628.

It is an arithmetic number, because the mean of its divisors is an integer number (360276).

2^2161628 is an apocalyptic number.

2161628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2161628 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2161628 is a wasteful number, since it uses less digits than its factorization.

2161628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77212 (or 77210 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 2161628 is about 1470.2475981956. The cubic root of 2161628 is about 129.2985493543.

The spelling of 2161628 in words is "two million, one hundred sixty-one thousand, six hundred twenty-eight".