720970897 has 4 divisors (see below), whose sum is σ = 725288256. Its totient is φ = 716653540.

The previous prime is 720970889. The next prime is 720970931. The reversal of 720970897 is 798079027.

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 720970897 - 2³ = 720970889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 720970897.

It is not an unprimeable number, because it can be changed into a prime (720970807) 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, 2158429 + ... + 2158762.

It is an arithmetic number, because the mean of its divisors is an integer number (181322064).

Almost surely, 2^720970897 is an apocalyptic number.

It is an amenable number.

720970897 is a deficient number, since it is larger than the sum of its proper divisors (4317359).

720970897 is a wasteful number, since it uses less digits than its factorization.

720970897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317358.

The product of its (nonzero) digits is 444528, while the sum is 49.

The square root of 720970897 is about 26850.9012325471. The cubic root of 720970897 is about 896.6836371047.

The spelling of 720970897 in words is "seven hundred twenty million, nine hundred seventy thousand, eight hundred ninety-seven".