70720297 has 2 divisors, whose sum is σ = 70720298. Its totient is φ = 70720296.

The previous prime is 70720267. The next prime is 70720303. The reversal of 70720297 is 79202707.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70207641 + 512656 = 8379^2 + 716^2 .

It is an emirp because it is prime and its reverse (79202707) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70720297 is a prime.

It is not a weakly prime, because it can be changed into another prime (70720217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35360148 + 35360149.

It is an arithmetic number, because the mean of its divisors is an integer number (35360149).

Almost surely, 2^70720297 is an apocalyptic number.

It is an amenable number.

70720297 is a deficient number, since it is larger than the sum of its proper divisors (1).

70720297 is an equidigital number, since it uses as much as digits as its factorization.

70720297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12348, while the sum is 34.

The square root of 70720297 is about 8409.5360751946. The cubic root of 70720297 is about 413.5373038696.

It can be divided in two parts, 70720 and 297, that added together give a palindrome (71017).

The spelling of 70720297 in words is "seventy million, seven hundred twenty thousand, two hundred ninety-seven".