720656501 has 8 divisors (see below), whose sum is σ = 733714944. Its totient is φ = 707638320.

The previous prime is 720656459. The next prime is 720656507. The reversal of 720656501 is 105656027.

It is a happy number.

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 720656501 - 2¹⁰ = 720655477 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 (720656507) 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, 27296 + ... + 46758.

It is an arithmetic number, because the mean of its divisors is an integer number (91714368).

Almost surely, 2^720656501 is an apocalyptic number.

It is an amenable number.

720656501 is a deficient number, since it is larger than the sum of its proper divisors (13058443).

720656501 is a wasteful number, since it uses less digits than its factorization.

720656501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20131.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 720656501 is about 26845.0461165557. The cubic root of 720656501 is about 896.5532782890.

The spelling of 720656501 in words is "seven hundred twenty million, six hundred fifty-six thousand, five hundred one".