646136106 has 64 divisors (see below), whose sum is σ = 1654732800. Its totient is φ = 163287360.

The previous prime is 646136083. The next prime is 646136137. The reversal of 646136106 is 601631646.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1806 + ... + 35993.

It is an arithmetic number, because the mean of its divisors is an integer number (25855200).

Almost surely, 2^646136106 is an apocalyptic number.

646136106 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 646136106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (827366400).

646136106 is an abundant number, since it is smaller than the sum of its proper divisors (1008596694).

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

646136106 is a wasteful number, since it uses less digits than its factorization.

646136106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37859.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 646136106 is about 25419.2074227345. The cubic root of 646136106 is about 864.5192539513.

The spelling of 646136106 in words is "six hundred forty-six million, one hundred thirty-six thousand, one hundred six".