644362046 has 4 divisors (see below), whose sum is σ = 966543072. Its totient is φ = 322181022.

The previous prime is 644362039. The next prime is 644362087. The reversal of 644362046 is 640263446.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×644362046² = 830404892650612232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 644361997 and 644362015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161090510 + ... + 161090513.

It is an arithmetic number, because the mean of its divisors is an integer number (241635768).

Almost surely, 2^644362046 is an apocalyptic number.

644362046 is a deficient number, since it is larger than the sum of its proper divisors (322181026).

644362046 is a wasteful number, since it uses less digits than its factorization.

644362046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322181025.

The product of its (nonzero) digits is 82944, while the sum is 35.

The square root of 644362046 is about 25384.2873841280. The cubic root of 644362046 is about 863.7273078831.

The spelling of 644362046 in words is "six hundred forty-four million, three hundred sixty-two thousand, forty-six".