644081030 has 16 divisors (see below), whose sum is σ = 1160363664. Its totient is φ = 257406240.

The previous prime is 644081027. The next prime is 644081033. The reversal of 644081030 is 30180446.

644081030 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (644081027) and next prime (644081033).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644081033) 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, 16061 + ... + 39320.

It is an arithmetic number, because the mean of its divisors is an integer number (72522729).

Almost surely, 2^644081030 is an apocalyptic number.

644081030 is a deficient number, since it is larger than the sum of its proper divisors (516282634).

644081030 is a wasteful number, since it uses less digits than its factorization.

644081030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56551.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 644081030 is about 25378.7515453381. The cubic root of 644081030 is about 863.6017281266.

The spelling of 644081030 in words is "six hundred forty-four million, eighty-one thousand, thirty".