643414670 has 16 divisors (see below), whose sum is σ = 1219101840. Its totient is φ = 243820224.

The previous prime is 643414649. The next prime is 643414679. The reversal of 643414670 is 76414346.

It is a self number, because there is not a number n which added to its sum of digits gives 643414670.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643414679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1693007 + ... + 1693386.

It is an arithmetic number, because the mean of its divisors is an integer number (76193865).

Almost surely, 2^643414670 is an apocalyptic number.

643414670 is a deficient number, since it is larger than the sum of its proper divisors (575687170).

643414670 is a wasteful number, since it uses less digits than its factorization.

643414670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3386419.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 643414670 is about 25365.6198426137. The cubic root of 643414670 is about 863.3038006955.

The spelling of 643414670 in words is "six hundred forty-three million, four hundred fourteen thousand, six hundred seventy".