6621630 has 16 divisors (see below), whose sum is σ = 15891984. Its totient is φ = 1765760.

The previous prime is 6621607. The next prime is 6621649. The reversal of 6621630 is 361266.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 6621630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110331 + ... + 110390.

It is an arithmetic number, because the mean of its divisors is an integer number (993249).

Almost surely, 2^6621630 is an apocalyptic number.

6621630 is an abundant number, since it is smaller than the sum of its proper divisors (9270354).

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

6621630 is a wasteful number, since it uses less digits than its factorization.

6621630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220731.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 6621630 is about 2573.2528053030. The cubic root of 6621630 is about 187.7824365664.

Adding to 6621630 its reverse (361266), we get a palindrome (6982896).

The spelling of 6621630 in words is "six million, six hundred twenty-one thousand, six hundred thirty".