644432034 has 32 divisors (see below), whose sum is σ = 1325307456. Its totient is φ = 208751040.

The previous prime is 644432029. The next prime is 644432051. The reversal of 644432034 is 430234446.

It is a junction number, because it is equal to n+sod(n) for n = 644431992 and 644432010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289044 + ... + 291264.

It is an arithmetic number, because the mean of its divisors is an integer number (41415858).

Almost surely, 2^644432034 is an apocalyptic number.

644432034 is an abundant number, since it is smaller than the sum of its proper divisors (680875422).

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

644432034 is a wasteful number, since it uses less digits than its factorization.

644432034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570.

The product of its (nonzero) digits is 27648, while the sum is 30.

The square root of 644432034 is about 25385.6659160243. The cubic root of 644432034 is about 863.7585782736.

The spelling of 644432034 in words is "six hundred forty-four million, four hundred thirty-two thousand, thirty-four".