70729409 has 2 divisors, whose sum is σ = 70729410. Its totient is φ = 70729408.

The previous prime is 70729339. The next prime is 70729427. The reversal of 70729409 is 90492707.

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., 46444225 + 24285184 = 6815^2 + 4928^2 .

It is a cyclic number.

It is not a de Polignac number, because 70729409 - 2¹² = 70725313 is a prime.

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, 35364704 + 35364705.

It is an arithmetic number, because the mean of its divisors is an integer number (35364705).

Almost surely, 2^70729409 is an apocalyptic number.

It is an amenable number.

70729409 is a deficient number, since it is larger than the sum of its proper divisors (1).

70729409 is an equidigital number, since it uses as much as digits as its factorization.

70729409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 70729409 is about 8410.0778236589. The cubic root of 70729409 is about 413.5550639293. Note that the first 3 decimals are identical.

The spelling of 70729409 in words is "seventy million, seven hundred twenty-nine thousand, four hundred nine".