720271917 has 6 divisors (see below), whose sum is σ = 1040392782. Its totient is φ = 480181272.

The previous prime is 720271913. The next prime is 720271919. The reversal of 720271917 is 719172027.

It can be written as a sum of positive squares in only one way, i.e., 500461641 + 219810276 = 22371^2 + 14826^2 .

It is not a de Polignac number, because 720271917 - 2² = 720271913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720271913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40015098 + ... + 40015115.

It is an arithmetic number, because the mean of its divisors is an integer number (173398797).

Almost surely, 2^720271917 is an apocalyptic number.

It is an amenable number.

720271917 is a deficient number, since it is larger than the sum of its proper divisors (320120865).

720271917 is a wasteful number, since it uses less digits than its factorization.

720271917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80030219 (or 80030216 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 36.

The square root of 720271917 is about 26837.8821258310. The cubic root of 720271917 is about 896.3937656785.

The spelling of 720271917 in words is "seven hundred twenty million, two hundred seventy-one thousand, nine hundred seventeen".