70720361 has 2 divisors, whose sum is σ = 70720362. Its totient is φ = 70720360.

The previous prime is 70720343. The next prime is 70720387. The reversal of 70720361 is 16302707.

It is an a-pointer prime, because the next prime (70720387) can be obtained adding 70720361 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67551961 + 3168400 = 8219^2 + 1780^2 .

It is a cyclic number.

It is not a de Polignac number, because 70720361 - 2⁶ = 70720297 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 70720361.

It is not a weakly prime, because it can be changed into another prime (70720861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35360180 + 35360181.

It is an arithmetic number, because the mean of its divisors is an integer number (35360181).

Almost surely, 2^70720361 is an apocalyptic number.

It is an amenable number.

70720361 is a deficient number, since it is larger than the sum of its proper divisors (1).

70720361 is an equidigital number, since it uses as much as digits as its factorization.

70720361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 70720361 is about 8409.5398803977. The cubic root of 70720361 is about 413.5374286164.

The spelling of 70720361 in words is "seventy million, seven hundred twenty thousand, three hundred sixty-one".