643642124 has 24 divisors (see below), whose sum is σ = 1175549760. Its totient is φ = 307967744.

The previous prime is 643642099. The next prime is 643642147. The reversal of 643642124 is 421246346.

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, 11444 + ... + 37659.

It is an arithmetic number, because the mean of its divisors is an integer number (48981240).

Almost surely, 2^643642124 is an apocalyptic number.

It is an amenable number.

643642124 is a deficient number, since it is larger than the sum of its proper divisors (531907636).

643642124 is a wasteful number, since it uses less digits than its factorization.

643642124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49249 (or 49247 counting only the distinct ones).

The product of its digits is 27648, while the sum is 32.

The square root of 643642124 is about 25370.1029560386. The cubic root of 643642124 is about 863.4055177673.

The spelling of 643642124 in words is "six hundred forty-three million, six hundred forty-two thousand, one hundred twenty-four".