643275 has 24 divisors (see below), whose sum is σ = 1182960. Its totient is φ = 342720.

The previous prime is 643273. The next prime is 643301. The reversal of 643275 is 572346.

It is a happy number.

643275 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643275 - 2¹ = 643273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 6 + 4⁷ + 2⁹ + 3¹² + 7⁵ + 5⁷ .

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (643273) 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, 199 + ... + 1151.

It is an arithmetic number, because the mean of its divisors is an integer number (49290).

2⁶⁴³²⁷⁵ is an apocalyptic number.

643275 is a deficient number, since it is larger than the sum of its proper divisors (539685).

643275 is a wasteful number, since it uses less digits than its factorization.

643275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972 (or 961 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 643275 is about 802.0442631177. The cubic root of 643275 is about 86.3241328611.

The spelling of 643275 in words is "six hundred forty-three thousand, two hundred seventy-five".