720717677 has 4 divisors (see below), whose sum is σ = 727715040. Its totient is φ = 713720316.

The previous prime is 720717649. The next prime is 720717689. The reversal of 720717677 is 776717027.

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, and also an emirpimes, since its reverse is a distinct semiprime: 776717027 = 4073 ⋅190699.

It is a cyclic number.

It is not a de Polignac number, because 720717677 - 2⁸ = 720717421 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 (720717607) 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, 3498527 + ... + 3498732.

It is an arithmetic number, because the mean of its divisors is an integer number (181928760).

Almost surely, 2^720717677 is an apocalyptic number.

It is an amenable number.

720717677 is a deficient number, since it is larger than the sum of its proper divisors (6997363).

720717677 is a wasteful number, since it uses less digits than its factorization.

720717677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6997362.

The product of its (nonzero) digits is 201684, while the sum is 44.

The square root of 720717677 is about 26846.1855204794. The cubic root of 720717677 is about 896.5786468205.

The spelling of 720717677 in words is "seven hundred twenty million, seven hundred seventeen thousand, six hundred seventy-seven".