70136709 has 4 divisors (see below), whose sum is σ = 93515616. Its totient is φ = 46757804.

The previous prime is 70136659. The next prime is 70136783. The reversal of 70136709 is 90763107.

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: 90763107 = 3 ⋅30254369.

It is a cyclic number.

It is not a de Polignac number, because 70136709 - 2⁹ = 70136197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70136709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70136009) 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, 11689449 + ... + 11689454.

It is an arithmetic number, because the mean of its divisors is an integer number (23378904).

Almost surely, 2^70136709 is an apocalyptic number.

It is an amenable number.

70136709 is a deficient number, since it is larger than the sum of its proper divisors (23378907).

70136709 is a wasteful number, since it uses less digits than its factorization.

70136709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23378906.

The product of its (nonzero) digits is 7938, while the sum is 33.

The square root of 70136709 is about 8374.7662056920. The cubic root of 70136709 is about 412.3966492227.

The spelling of 70136709 in words is "seventy million, one hundred thirty-six thousand, seven hundred nine".