720681653 has 8 divisors (see below), whose sum is σ = 729641472. Its totient is φ = 711777456.

The previous prime is 720681631. The next prime is 720681659. The reversal of 720681653 is 356186027.

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

It is a cyclic number.

It is not a de Polignac number, because 720681653 - 2¹⁰ = 720680629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720681659) 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, 12476 + ... + 39962.

It is an arithmetic number, because the mean of its divisors is an integer number (91205184).

Almost surely, 2^720681653 is an apocalyptic number.

It is an amenable number.

720681653 is a deficient number, since it is larger than the sum of its proper divisors (8959819).

720681653 is a wasteful number, since it uses less digits than its factorization.

720681653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27811.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 720681653 is about 26845.5145787895. The cubic root of 720681653 is about 896.5637085220.

The spelling of 720681653 in words is "seven hundred twenty million, six hundred eighty-one thousand, six hundred fifty-three".