70967721 has 16 divisors (see below), whose sum is σ = 104232960. Its totient is φ = 42591120.

The previous prime is 70967683. The next prime is 70967779. The reversal of 70967721 is 12776907.

It is not a de Polignac number, because 70967721 - 2¹⁰ = 70966697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70967721.

It is not an unprimeable number, because it can be changed into a prime (70967521) 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, 7041 + ... + 13838.

It is an arithmetic number, because the mean of its divisors is an integer number (6514560).

Almost surely, 2^70967721 is an apocalyptic number.

It is an amenable number.

70967721 is a deficient number, since it is larger than the sum of its proper divisors (33265239).

70967721 is a wasteful number, since it uses less digits than its factorization.

70967721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20996.

The product of its (nonzero) digits is 37044, while the sum is 39.

The square root of 70967721 is about 8424.2341491675. The cubic root of 70967721 is about 414.0190135728.

The spelling of 70967721 in words is "seventy million, nine hundred sixty-seven thousand, seven hundred twenty-one".