720655601 has 4 divisors (see below), whose sum is σ = 724971072. Its totient is φ = 716340132.

The previous prime is 720655577. The next prime is 720655613. The reversal of 720655601 is 106556027.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 720655601 - 2²² = 716461297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720655651) 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, 2157485 + ... + 2157818.

It is an arithmetic number, because the mean of its divisors is an integer number (181242768).

Almost surely, 2^720655601 is an apocalyptic number.

It is an amenable number.

720655601 is a deficient number, since it is larger than the sum of its proper divisors (4315471).

720655601 is a wasteful number, since it uses less digits than its factorization.

720655601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4315470.

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

The square root of 720655601 is about 26845.0293536811. The cubic root of 720655601 is about 896.5529050653.

The spelling of 720655601 in words is "seven hundred twenty million, six hundred fifty-five thousand, six hundred one".