644342498 has 16 divisors (see below), whose sum is σ = 980035200. Its totient is φ = 317693376.

The previous prime is 644342477. The next prime is 644342507. The reversal of 644342498 is 894243446.

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, 37811 + ... + 52137.

It is an arithmetic number, because the mean of its divisors is an integer number (61252200).

Almost surely, 2^644342498 is an apocalyptic number.

644342498 is a deficient number, since it is larger than the sum of its proper divisors (335692702).

644342498 is a wasteful number, since it uses less digits than its factorization.

644342498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14641.

The product of its digits is 663552, while the sum is 44.

The square root of 644342498 is about 25383.9023398689. The cubic root of 644342498 is about 863.7185735015.

The spelling of 644342498 in words is "six hundred forty-four million, three hundred forty-two thousand, four hundred ninety-eight".