70308261 has 24 divisors (see below), whose sum is σ = 103236120. Its totient is φ = 46104576.

The previous prime is 70308253. The next prime is 70308269. The reversal of 70308261 is 16280307.

It is an interprime number because it is at equal distance from previous prime (70308253) and next prime (70308269).

It can be written as a sum of positive squares in 4 ways, for example, as 1252161 + 69056100 = 1119^2 + 8310^2 .

It is not a de Polignac number, because 70308261 - 2³ = 70308253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70308269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 261235 + ... + 261503.

It is an arithmetic number, because the mean of its divisors is an integer number (4301505).

Almost surely, 2^70308261 is an apocalyptic number.

It is an amenable number.

70308261 is a deficient number, since it is larger than the sum of its proper divisors (32927859).

70308261 is a wasteful number, since it uses less digits than its factorization.

70308261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 70308261 is about 8385.0021466902. The cubic root of 70308261 is about 412.7326115039.

Adding to 70308261 its reverse (16280307), we get a palindrome (86588568).

The spelling of 70308261 in words is "seventy million, three hundred eight thousand, two hundred sixty-one".