643400610 has 32 divisors (see below), whose sum is σ = 1625434560. Its totient is φ = 162543168.

The previous prime is 643400587. The next prime is 643400623. The reversal of 643400610 is 16004346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 563817 + ... + 564956.

It is an arithmetic number, because the mean of its divisors is an integer number (50794830).

Almost surely, 2^643400610 is an apocalyptic number.

643400610 is an abundant number, since it is smaller than the sum of its proper divisors (982033950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643400610 is a wasteful number, since it uses less digits than its factorization.

643400610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128802.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 643400610 is about 25365.3426943142. The cubic root of 643400610 is about 863.2975122989.

Adding to 643400610 its reverse (16004346), we get a palindrome (659404956).

The spelling of 643400610 in words is "six hundred forty-three million, four hundred thousand, six hundred ten".