670022721 has 6 divisors (see below), whose sum is σ = 967810610. Its totient is φ = 446681808.

The previous prime is 670022711. The next prime is 670022791. The reversal of 670022721 is 127220076.

It can be written as a sum of positive squares in only one way, i.e., 492840000 + 177182721 = 22200^2 + 13311^2 .

It is not a de Polignac number, because 670022721 - 2²² = 665828417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670022711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37223476 + ... + 37223493.

Almost surely, 2^670022721 is an apocalyptic number.

It is an amenable number.

670022721 is a deficient number, since it is larger than the sum of its proper divisors (297787889).

670022721 is a wasteful number, since it uses less digits than its factorization.

670022721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74446975 (or 74446972 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 670022721 is about 25884.7971017739. The cubic root of 670022721 is about 875.0439035386.

Adding to 670022721 its reverse (127220076), we get a palindrome (797242797).

The spelling of 670022721 in words is "six hundred seventy million, twenty-two thousand, seven hundred twenty-one".