644106092 has 12 divisors (see below), whose sum is σ = 1288212240. Its totient is φ = 276045456.

The previous prime is 644106079. The next prime is 644106097. The reversal of 644106092 is 290601446.

It is a happy number.

644106092 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (644106097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11501867 + ... + 11501922.

It is an arithmetic number, because the mean of its divisors is an integer number (107351020).

Almost surely, 2^644106092 is an apocalyptic number.

It is an amenable number.

644106092 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

644106092 is a wasteful number, since it uses less digits than its factorization.

644106092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23003800 (or 23003798 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 644106092 is about 25379.2453000478. The cubic root of 644106092 is about 863.6129292565.

The spelling of 644106092 in words is "six hundred forty-four million, one hundred six thousand, ninety-two".