70643913 has 16 divisors (see below), whose sum is σ = 98167680. Its totient is φ = 45132416.

The previous prime is 70643899. The next prime is 70643921. The reversal of 70643913 is 31934607.

It is a cyclic number.

It is not a de Polignac number, because 70643913 - 2⁴ = 70643897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70643113) by changing a digit.

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, 8956 + ... + 14882.

It is an arithmetic number, because the mean of its divisors is an integer number (6135480).

Almost surely, 2^70643913 is an apocalyptic number.

It is an amenable number.

70643913 is a deficient number, since it is larger than the sum of its proper divisors (27523767).

70643913 is a wasteful number, since it uses less digits than its factorization.

70643913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6096.

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 70643913 is about 8404.9933372966. The cubic root of 70643913 is about 413.3883649556.

The spelling of 70643913 in words is "seventy million, six hundred forty-three thousand, nine hundred thirteen".