670701721 has 8 divisors (see below), whose sum is σ = 677799144. Its totient is φ = 663636480.

The previous prime is 670701719. The next prime is 670701727. The reversal of 670701721 is 127107076.

It can be written as a sum of positive squares in 4 ways, for example, as 124077321 + 546624400 = 11139^2 + 23380^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 670701721 - 2¹ = 670701719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670701727) 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, 35061 + ... + 50701.

It is an arithmetic number, because the mean of its divisors is an integer number (84724893).

Almost surely, 2^670701721 is an apocalyptic number.

It is an amenable number.

670701721 is a deficient number, since it is larger than the sum of its proper divisors (7097423).

670701721 is a wasteful number, since it uses less digits than its factorization.

670701721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16091.

The product of its (nonzero) digits is 4116, while the sum is 31.

The square root of 670701721 is about 25897.9095874551. The cubic root of 670701721 is about 875.3393931290.

Adding to 670701721 its reverse (127107076), we get a palindrome (797808797).

The spelling of 670701721 in words is "six hundred seventy million, seven hundred one thousand, seven hundred twenty-one".