70309205 has 4 divisors (see below), whose sum is σ = 84371052. Its totient is φ = 56247360.

The previous prime is 70309157. The next prime is 70309207. The reversal of 70309205 is 50290307.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50290307 = 181 ⋅277847.

It can be written as a sum of positive squares in 2 ways, for example, as 46553329 + 23755876 = 6823^2 + 4874^2 .

It is not a de Polignac number, because 70309205 - 2¹⁰ = 70308181 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 (70309207) 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, 7030916 + ... + 7030925.

It is an arithmetic number, because the mean of its divisors is an integer number (21092763).

Almost surely, 2^70309205 is an apocalyptic number.

It is an amenable number.

70309205 is a deficient number, since it is larger than the sum of its proper divisors (14061847).

70309205 is a wasteful number, since it uses less digits than its factorization.

70309205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14061846.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 70309205 is about 8385.0584374827. The cubic root of 70309205 is about 412.7344586924.

The spelling of 70309205 in words is "seventy million, three hundred nine thousand, two hundred five".