613312720 has 20 divisors (see below), whose sum is σ = 1425952260. Its totient is φ = 245325056.

The previous prime is 613312699. The next prime is 613312759. The reversal of 613312720 is 27213316.

It can be written as a sum of positive squares in 2 ways, for example, as 189117504 + 424195216 = 13752^2 + 20596^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3833125 + ... + 3833284.

It is an arithmetic number, because the mean of its divisors is an integer number (71297613).

Almost surely, 2^613312720 is an apocalyptic number.

It is an amenable number.

613312720 is an abundant number, since it is smaller than the sum of its proper divisors (812639540).

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

613312720 is a wasteful number, since it uses less digits than its factorization.

613312720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7666422 (or 7666416 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 613312720 is about 24765.1513219685. The cubic root of 613312720 is about 849.6250803287.

The spelling of 613312720 in words is "six hundred thirteen million, three hundred twelve thousand, seven hundred twenty".