644920094 has 64 divisors (see below), whose sum is σ = 1238802432. Its totient is φ = 244944000.

The previous prime is 644920093. The next prime is 644920103. The reversal of 644920094 is 490029446.

644920094 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644920093) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 851564 + ... + 852320.

It is an arithmetic number, because the mean of its divisors is an integer number (19356288).

Almost surely, 2^644920094 is an apocalyptic number.

644920094 is a deficient number, since it is larger than the sum of its proper divisors (593882338).

644920094 is a wasteful number, since it uses less digits than its factorization.

644920094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 644920094 is about 25395.2770018364. The cubic root of 644920094 is about 863.9765788333.

The spelling of 644920094 in words is "six hundred forty-four million, nine hundred twenty thousand, ninety-four".