643622 has 16 divisors (see below), whose sum is σ = 1139712. Its totient is φ = 266760.

The previous prime is 643619. The next prime is 643633. The reversal of 643622 is 226346.

It is a nialpdrome in base 15.

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, 308 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (71232).

2⁶⁴³⁶²² is an apocalyptic number.

643622 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

643622 is a deficient number, since it is larger than the sum of its proper divisors (496090).

643622 is a wasteful number, since it uses less digits than its factorization.

643622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523.

The product of its digits is 1728, while the sum is 23.

The square root of 643622 is about 802.2605561786. The cubic root of 643622 is about 86.3396519312.

Adding to 643622 its reverse (226346), we get a palindrome (869968).

The spelling of 643622 in words is "six hundred forty-three thousand, six hundred twenty-two".