3215256705 has 24 divisors (see below), whose sum is σ = 5597048808. Its totient is φ = 1707438336.

The previous prime is 3215256683. The next prime is 3215256761. The reversal of 3215256705 is 5076525123.

It can be written as a sum of positive squares in 4 ways, for example, as 153958464 + 3061298241 = 12408^2 + 55329^2 .

It is not a de Polignac number, because 3215256705 - 2¹¹ = 3215254657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3215256705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142842 + ... + 163811.

It is an arithmetic number, because the mean of its divisors is an integer number (233210367).

Almost surely, 2^3215256705 is an apocalyptic number.

It is an amenable number.

3215256705 is a deficient number, since it is larger than the sum of its proper divisors (2381792103).

3215256705 is a wasteful number, since it uses less digits than its factorization.

3215256705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306897 (or 306894 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 3215256705 is about 56703.2336379505. The cubic root of 3215256705 is about 1475.9508116443.

The spelling of 3215256705 in words is "three billion, two hundred fifteen million, two hundred fifty-six thousand, seven hundred five".