70205690 has 32 divisors (see below), whose sum is σ = 128764944. Its totient is φ = 27555840.

The previous prime is 70205689. The next prime is 70205743. The reversal of 70205690 is 9650207.

It can be written as a sum of positive squares in 8 ways, for example, as 15578809 + 54626881 = 3947^2 + 7391^2 .

It is a super-2 number, since 2×70205690² = 9857677816752200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152060 + ... + 152520.

Almost surely, 2^70205690 is an apocalyptic number.

70205690 is a deficient number, since it is larger than the sum of its proper divisors (58559254).

70205690 is a wasteful number, since it uses less digits than its factorization.

70205690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 70205690 is about 8378.8835771838. The cubic root of 70205690 is about 412.5318053223.

Adding to 70205690 its reverse (9650207), we get a palindrome (79855897).

The spelling of 70205690 in words is "seventy million, two hundred five thousand, six hundred ninety".