643454 has 32 divisors (see below), whose sum is σ = 1209600. Its totient is φ = 250560.

The previous prime is 643453. The next prime is 643457. The reversal of 643454 is 454346.

Its product of digits (5760) is a multiple of the sum of its prime divisors (128).

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 643454.

It is not an unprimeable number, because it can be changed into a prime (643453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10877 + ... + 10935.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2⁶⁴³⁴⁵⁴ is an apocalyptic number.

643454 is a deficient number, since it is larger than the sum of its proper divisors (566146).

643454 is a wasteful number, since it uses less digits than its factorization.

643454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128.

The product of its digits is 5760, while the sum is 26.

The square root of 643454 is about 802.1558452072. The cubic root of 643454 is about 86.3321390724.

The spelling of 643454 in words is "six hundred forty-three thousand, four hundred fifty-four".