644622354 has 32 divisors (see below), whose sum is σ = 1516760640. Its totient is φ = 202234176.

The previous prime is 644622317. The next prime is 644622373. The reversal of 644622354 is 453226446.

644622354 is a `hidden beast` number, since 644 + 6 + 2 + 2 + 3 + 5 + 4 = 666.

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, 350184 + ... + 352019.

It is an arithmetic number, because the mean of its divisors is an integer number (47398770).

Almost surely, 2^644622354 is an apocalyptic number.

644622354 is an abundant number, since it is smaller than the sum of its proper divisors (872138286).

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

644622354 is a wasteful number, since it uses less digits than its factorization.

644622354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702231 (or 702225 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 644622354 is about 25389.4142114386. The cubic root of 644622354 is about 863.8436011275.

The spelling of 644622354 in words is "six hundred forty-four million, six hundred twenty-two thousand, three hundred fifty-four".