70115721 has 8 divisors (see below), whose sum is σ = 100679040. Its totient is φ = 43148112.

The previous prime is 70115711. The next prime is 70115737. The reversal of 70115721 is 12751107.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 70115721 - 2⁷ = 70115593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 70115691 and 70115700.

It is not an unprimeable number, because it can be changed into a prime (70115711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 898881 + ... + 898958.

It is an arithmetic number, because the mean of its divisors is an integer number (12584880).

Almost surely, 2^70115721 is an apocalyptic number.

It is an amenable number.

70115721 is a deficient number, since it is larger than the sum of its proper divisors (30563319).

70115721 is a wasteful number, since it uses less digits than its factorization.

70115721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797855.

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 70115721 is about 8373.5130620308. The cubic root of 70115721 is about 412.3555093569.

Adding to 70115721 its reverse (12751107), we get a palindrome (82866828).

The spelling of 70115721 in words is "seventy million, one hundred fifteen thousand, seven hundred twenty-one".