70309729 has 4 divisors (see below), whose sum is σ = 80353984. Its totient is φ = 60265476.

The previous prime is 70309721. The next prime is 70309751. The reversal of 70309729 is 92790307.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92790307 = 1117 ⋅83071.

It is a cyclic number.

It is not a de Polignac number, because 70309729 - 2³ = 70309721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70309721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5022117 + ... + 5022130.

It is an arithmetic number, because the mean of its divisors is an integer number (20088496).

Almost surely, 2^70309729 is an apocalyptic number.

It is an amenable number.

70309729 is a deficient number, since it is larger than the sum of its proper divisors (10044255).

70309729 is a wasteful number, since it uses less digits than its factorization.

70309729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10044254.

The product of its (nonzero) digits is 23814, while the sum is 37.

The square root of 70309729 is about 8385.0896834798. The cubic root of 70309729 is about 412.7354840315.

The spelling of 70309729 in words is "seventy million, three hundred nine thousand, seven hundred twenty-nine".