644062611 has 8 divisors (see below), whose sum is σ = 859317184. Its totient is φ = 429091560.

The previous prime is 644062609. The next prime is 644062633. The reversal of 644062611 is 116260446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 644062611 - 2¹ = 644062609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644062681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65521 + ... + 74706.

It is an arithmetic number, because the mean of its divisors is an integer number (107414648).

Almost surely, 2^644062611 is an apocalyptic number.

644062611 is a deficient number, since it is larger than the sum of its proper divisors (215254573).

644062611 is a wasteful number, since it uses less digits than its factorization.

644062611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141761.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 644062611 is about 25378.3886604331. The cubic root of 644062611 is about 863.5934958126.

It can be divided in two parts, 64 and 4062611, that added together give a triangular number (4062675 = T₂₈₅₀).

The spelling of 644062611 in words is "six hundred forty-four million, sixty-two thousand, six hundred eleven".