1616447644 has 24 divisors (see below), whose sum is σ = 3251592288. Its totient is φ = 688756800.

The previous prime is 1616447639. The next prime is 1616447647. The reversal of 1616447644 is 4467446161.

It is a super-2 number, since 2×1616447644² = 5225805971586301472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1616447644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616447647) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 162007 + ... + 171694.

It is an arithmetic number, because the mean of its divisors is an integer number (135483012).

Almost surely, 2^1616447644 is an apocalyptic number.

1616447644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1616447644 is an abundant number, since it is smaller than the sum of its proper divisors (1635144644).

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

1616447644 is a wasteful number, since it uses less digits than its factorization.

1616447644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333885 (or 333883 counting only the distinct ones).

The product of its digits is 387072, while the sum is 43.

The square root of 1616447644 is about 40205.0698793075. The cubic root of 1616447644 is about 1173.6012070972.

The spelling of 1616447644 in words is "one billion, six hundred sixteen million, four hundred forty-seven thousand, six hundred forty-four".