644049354 has 16 divisors (see below), whose sum is σ = 1387183392. Its totient is φ = 198169008.

The previous prime is 644049347. The next prime is 644049383. The reversal of 644049354 is 453940446.

644049354 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4128444 + ... + 4128599.

It is an arithmetic number, because the mean of its divisors is an integer number (86698962).

Almost surely, 2^644049354 is an apocalyptic number.

644049354 is an abundant number, since it is smaller than the sum of its proper divisors (743134038).

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

644049354 is a wasteful number, since it uses less digits than its factorization.

644049354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8257061.

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 644049354 is about 25378.1274722939. The cubic root of 644049354 is about 863.5875705411.

The spelling of 644049354 in words is "six hundred forty-four million, forty-nine thousand, three hundred fifty-four".