70729309 has 4 divisors (see below), whose sum is σ = 80833504. Its totient is φ = 60625116.

The previous prime is 70729303. The next prime is 70729319. The reversal of 70729309 is 90392707.

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.

It is a cyclic number.

It is not a de Polignac number, because 70729309 - 2²³ = 62340701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70729303) 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, 5052087 + ... + 5052100.

It is an arithmetic number, because the mean of its divisors is an integer number (20208376).

Almost surely, 2^70729309 is an apocalyptic number.

It is an amenable number.

70729309 is a deficient number, since it is larger than the sum of its proper divisors (10104195).

70729309 is a wasteful number, since it uses less digits than its factorization.

70729309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10104194.

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

The square root of 70729309 is about 8410.0718784087. The cubic root of 70729309 is about 413.5548690291.

The spelling of 70729309 in words is "seventy million, seven hundred twenty-nine thousand, three hundred nine".