720842613 has 8 divisors (see below), whose sum is σ = 961396800. Its totient is φ = 480425088.

The previous prime is 720842593. The next prime is 720842627. The reversal of 720842613 is 316248027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 720842613 - 2²⁵ = 687288181 is a prime.

It is a super-2 number, since 2×720842613² = 1039228145433335538, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720842693) 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, 21148 + ... + 43461.

It is an arithmetic number, because the mean of its divisors is an integer number (120174600).

Almost surely, 2^720842613 is an apocalyptic number.

It is an amenable number.

720842613 is a deficient number, since it is larger than the sum of its proper divisors (240554187).

720842613 is a wasteful number, since it uses less digits than its factorization.

720842613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68331.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 720842613 is about 26848.5123051539. The cubic root of 720842613 is about 896.6304509603.

The spelling of 720842613 in words is "seven hundred twenty million, eight hundred forty-two thousand, six hundred thirteen".