1606344640 has 56 divisors (see below), whose sum is σ = 3928518432. Its totient is φ = 625167360.

The previous prime is 1606344629. The next prime is 1606344643. The reversal of 1606344640 is 464436061.

It is a junction number, because it is equal to n+sod(n) for n = 1606344596 and 1606344605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606344643) 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, 55996 + ... + 79675.

Almost surely, 2^1606344640 is an apocalyptic number.

1606344640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1606344640 is an abundant number, since it is smaller than the sum of its proper divisors (2322173792).

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

1606344640 is a wasteful number, since it uses less digits than its factorization.

1606344640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135725 (or 135715 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 1606344640 is about 40079.2295335127. The cubic root of 1606344640 is about 1171.1510429485.

The spelling of 1606344640 in words is "one billion, six hundred six million, three hundred forty-four thousand, six hundred forty".