70729691 has 2 divisors, whose sum is σ = 70729692. Its totient is φ = 70729690.

The previous prime is 70729661. The next prime is 70729697. The reversal of 70729691 is 19692707.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70729691 - 2¹⁰ = 70728667 is a prime.

It is not a weakly prime, because it can be changed into another prime (70729697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35364845 + 35364846.

It is an arithmetic number, because the mean of its divisors is an integer number (35364846).

Almost surely, 2^70729691 is an apocalyptic number.

70729691 is a deficient number, since it is larger than the sum of its proper divisors (1).

70729691 is an equidigital number, since it uses as much as digits as its factorization.

70729691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 70729691 is about 8410.0945892421. The cubic root of 70729691 is about 413.5556135469. Note that the first 3 decimals are identical.

The spelling of 70729691 in words is "seventy million, seven hundred twenty-nine thousand, six hundred ninety-one".