10643220 has 72 divisors (see below), whose sum is σ = 36900864. Its totient is φ = 2432448.

The previous prime is 10643209. The next prime is 10643221. The reversal of 10643220 is 2234601.

It is a happy number.

10643220 is a `hidden beast` number, since 1 + 0 + 643 + 2 + 20 = 666.

It is a super-2 number, since 2×10643220² = 226556263936800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 10643193 and 10643202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10643221) 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, 2964 + ... + 5483.

It is an arithmetic number, because the mean of its divisors is an integer number (512512).

Almost surely, 2^10643220 is an apocalyptic number.

10643220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10643220 is an abundant number, since it is smaller than the sum of its proper divisors (26257644).

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

10643220 is a wasteful number, since it uses less digits than its factorization.

10643220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8469 (or 8464 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 10643220 is about 3262.3948258909. The cubic root of 10643220 is about 219.9670749625.

Adding to 10643220 its reverse (2234601), we get a palindrome (12877821).

The spelling of 10643220 in words is "ten million, six hundred forty-three thousand, two hundred twenty".