670627721 has 4 divisors (see below), whose sum is σ = 699785472. Its totient is φ = 641469972.

The previous prime is 670627703. The next prime is 670627729. The reversal of 670627721 is 127726076.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 670627721 - 2²⁶ = 603518857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670627729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14578841 + ... + 14578886.

It is an arithmetic number, because the mean of its divisors is an integer number (174946368).

Almost surely, 2^670627721 is an apocalyptic number.

It is an amenable number.

670627721 is a deficient number, since it is larger than the sum of its proper divisors (29157751).

670627721 is a wasteful number, since it uses less digits than its factorization.

670627721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29157750.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 670627721 is about 25896.4808613062. The cubic root of 670627721 is about 875.3071992364.

The spelling of 670627721 in words is "six hundred seventy million, six hundred twenty-seven thousand, seven hundred twenty-one".