70685309 has 4 divisors (see below), whose sum is σ = 70739904. Its totient is φ = 70630716.

The previous prime is 70685261. The next prime is 70685311. The reversal of 70685309 is 90358607.

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: 90358607 = 419 ⋅215653.

It is a cyclic number.

It is not a de Polignac number, because 70685309 - 2¹² = 70681213 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 (70685369) 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, 25307 + ... + 27960.

It is an arithmetic number, because the mean of its divisors is an integer number (17684976).

Almost surely, 2^70685309 is an apocalyptic number.

It is an amenable number.

70685309 is a deficient number, since it is larger than the sum of its proper divisors (54595).

70685309 is a wasteful number, since it uses less digits than its factorization.

70685309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54594.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 70685309 is about 8407.4555603940. The cubic root of 70685309 is about 413.4690951160.

The spelling of 70685309 in words is "seventy million, six hundred eighty-five thousand, three hundred nine".