70143721 has 16 divisors (see below), whose sum is σ = 76527360. Its totient is φ = 64088640.

The previous prime is 70143701. The next prime is 70143737. The reversal of 70143721 is 12734107.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 70143721 - 2⁹ = 70143209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70143701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68191 + ... + 69211.

It is an arithmetic number, because the mean of its divisors is an integer number (4782960).

Almost surely, 2^70143721 is an apocalyptic number.

It is an amenable number.

70143721 is a deficient number, since it is larger than the sum of its proper divisors (6383639).

70143721 is a wasteful number, since it uses less digits than its factorization.

70143721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 70143721 is about 8375.1848337813. The cubic root of 70143721 is about 412.4103920448.

Adding to 70143721 its reverse (12734107), we get a palindrome (82877828).

The spelling of 70143721 in words is "seventy million, one hundred forty-three thousand, seven hundred twenty-one".