613631440 has 20 divisors (see below), whose sum is σ = 1426693284. Its totient is φ = 245452544.

The previous prime is 613631407. The next prime is 613631443. The reversal of 613631440 is 44136316.

It can be written as a sum of positive squares in 2 ways, for example, as 157552704 + 456078736 = 12552^2 + 21356^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 613631399 and 613631408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613631443) 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, 3835117 + ... + 3835276.

Almost surely, 2^613631440 is an apocalyptic number.

It is an amenable number.

613631440 is an abundant number, since it is smaller than the sum of its proper divisors (813061844).

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

613631440 is a wasteful number, since it uses less digits than its factorization.

613631440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7670406 (or 7670400 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 613631440 is about 24771.5853348146. The cubic root of 613631440 is about 849.7722296284.

Adding to 613631440 its reverse (44136316), we get a palindrome (657767756).

The spelling of 613631440 in words is "six hundred thirteen million, six hundred thirty-one thousand, four hundred forty".