70729427 has 2 divisors, whose sum is σ = 70729428. Its totient is φ = 70729426.

The previous prime is 70729409. The next prime is 70729429. The reversal of 70729427 is 72492707.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70729427 - 2⁸ = 70729171 is a prime.

Together with 70729429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70729429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35364713 + 35364714.

It is an arithmetic number, because the mean of its divisors is an integer number (35364714).

Almost surely, 2^70729427 is an apocalyptic number.

70729427 is a deficient number, since it is larger than the sum of its proper divisors (1).

70729427 is an equidigital number, since it uses as much as digits as its factorization.

70729427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 70729427 is about 8410.0788938036. The cubic root of 70729427 is about 413.5550990113. Note that the first 3 decimals are identical.

The spelling of 70729427 in words is "seventy million, seven hundred twenty-nine thousand, four hundred twenty-seven".