643476 has 12 divisors (see below), whose sum is σ = 1501472. Its totient is φ = 214488.

The previous prime is 643469. The next prime is 643493. The reversal of 643476 is 674346.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×643476² = 828122725152, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6³ + 4⁹ + 4⁹ + 3³ + 7⁶ + 6⁴ .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643476.

It is an unprimeable number.

643476 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26800 + ... + 26823.

2⁶⁴³⁴⁷⁶ is an apocalyptic number.

It is an amenable number.

643476 is an abundant number, since it is smaller than the sum of its proper divisors (857996).

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

643476 is a wasteful number, since it uses less digits than its factorization.

643476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53630 (or 53628 counting only the distinct ones).

The product of its digits is 12096, while the sum is 30.

The square root of 643476 is about 802.1695581359. The cubic root of 643476 is about 86.3331229735. Note that the first 3 decimals are identical.

The spelling of 643476 in words is "six hundred forty-three thousand, four hundred seventy-six".