644670062 has 4 divisors (see below), whose sum is σ = 967005096. Its totient is φ = 322335030.

The previous prime is 644670041. The next prime is 644670109. The reversal of 644670062 is 260076446.

It is a happy number.

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

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, 161167514 + ... + 161167517.

It is an arithmetic number, because the mean of its divisors is an integer number (241751274).

Almost surely, 2^644670062 is an apocalyptic number.

644670062 is a deficient number, since it is larger than the sum of its proper divisors (322335034).

644670062 is a wasteful number, since it uses less digits than its factorization.

644670062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322335033.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 644670062 is about 25390.3537194739. The cubic root of 644670062 is about 863.8649113999.

The spelling of 644670062 in words is "six hundred forty-four million, six hundred seventy thousand, sixty-two".