644151162 has 16 divisors (see below), whose sum is σ = 1291519872. Its totient is φ = 214180800.

The previous prime is 644151083. The next prime is 644151169. The reversal of 644151162 is 261151446.

It is not an unprimeable number, because it can be changed into a prime (644151169) 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, 131458 + ... + 136269.

It is an arithmetic number, because the mean of its divisors is an integer number (80719992).

Almost surely, 2^644151162 is an apocalyptic number.

644151162 is an abundant number, since it is smaller than the sum of its proper divisors (647368710).

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

644151162 is a wasteful number, since it uses less digits than its factorization.

644151162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268133.

The product of its digits is 5760, while the sum is 30.

The square root of 644151162 is about 25380.1332147804. The cubic root of 644151162 is about 863.6330719666.

The spelling of 644151162 in words is "six hundred forty-four million, one hundred fifty-one thousand, one hundred sixty-two".