70728641 has 2 divisors, whose sum is σ = 70728642. Its totient is φ = 70728640.

The previous prime is 70728631. The next prime is 70728667. The reversal of 70728641 is 14682707.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46512400 + 24216241 = 6820^2 + 4921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70728641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70728631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35364320 + 35364321.

It is an arithmetic number, because the mean of its divisors is an integer number (35364321).

Almost surely, 2^70728641 is an apocalyptic number.

It is an amenable number.

70728641 is a deficient number, since it is larger than the sum of its proper divisors (1).

70728641 is an equidigital number, since it uses as much as digits as its factorization.

70728641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 70728641 is about 8410.0321640289. The cubic root of 70728641 is about 413.5535670912.

The spelling of 70728641 in words is "seventy million, seven hundred twenty-eight thousand, six hundred forty-one".