613387644 has 48 divisors (see below), whose sum is σ = 1510306560. Its totient is φ = 193367680.

The previous prime is 613387639. The next prime is 613387651. The reversal of 613387644 is 446783316.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 613387596 and 613387605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12079 + ... + 37049.

It is an arithmetic number, because the mean of its divisors is an integer number (31464720).

Almost surely, 2^613387644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 613387644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (755153280).

613387644 is an abundant number, since it is smaller than the sum of its proper divisors (896918916).

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

613387644 is a wasteful number, since it uses less digits than its factorization.

613387644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25090 (or 25088 counting only the distinct ones).

The product of its digits is 290304, while the sum is 42.

The square root of 613387644 is about 24766.6639659038. The cubic root of 613387644 is about 849.6596764466.

The spelling of 613387644 in words is "six hundred thirteen million, three hundred eighty-seven thousand, six hundred forty-four".