670639421 has 8 divisors (see below), whose sum is σ = 673732800. Its totient is φ = 667554048.

The previous prime is 670639397. The next prime is 670639427. The reversal of 670639421 is 124936076.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670639421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670639427) 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, 217130 + ... + 220196.

It is an arithmetic number, because the mean of its divisors is an integer number (84216600).

Almost surely, 2^670639421 is an apocalyptic number.

It is an amenable number.

670639421 is a deficient number, since it is larger than the sum of its proper divisors (3093379).

670639421 is a wasteful number, since it uses less digits than its factorization.

670639421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4003.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 670639421 is about 25896.7067597407. The cubic root of 670639421 is about 875.3122895095.

The spelling of 670639421 in words is "six hundred seventy million, six hundred thirty-nine thousand, four hundred twenty-one".