8643630 has 32 divisors (see below), whose sum is σ = 21648384. Its totient is φ = 2204576.

The previous prime is 8643619. The next prime is 8643631. The reversal of 8643630 is 363468.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8643631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5574 + ... + 6953.

It is an arithmetic number, because the mean of its divisors is an integer number (676512).

Almost surely, 2^8643630 is an apocalyptic number.

8643630 is an abundant number, since it is smaller than the sum of its proper divisors (13004754).

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

8643630 is a wasteful number, since it uses less digits than its factorization.

8643630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12560.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 8643630 is about 2940.0051020364. The cubic root of 8643630 is about 205.2258466734.

Subtracting from 8643630 its sum of digits (30), we obtain a square (8643600 = 2940²).

The spelling of 8643630 in words is "eight million, six hundred forty-three thousand, six hundred thirty".