643252454 has 16 divisors (see below), whose sum is σ = 1084279392. Its totient is φ = 283977408.

The previous prime is 643252433. The next prime is 643252471. The reversal of 643252454 is 454252346.

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, 537239 + ... + 538434.

It is an arithmetic number, because the mean of its divisors is an integer number (67767462).

Almost surely, 2^643252454 is an apocalyptic number.

643252454 is a deficient number, since it is larger than the sum of its proper divisors (441026938).

643252454 is a wasteful number, since it uses less digits than its factorization.

643252454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075711.

The product of its digits is 115200, while the sum is 35.

The square root of 643252454 is about 25362.4220846511. The cubic root of 643252454 is about 863.2312433094.

The spelling of 643252454 in words is "six hundred forty-three million, two hundred fifty-two thousand, four hundred fifty-four".