670245421 has 16 divisors (see below), whose sum is σ = 690610176. Its totient is φ = 650277936.

The previous prime is 670245413. The next prime is 670245449. The reversal of 670245421 is 124542076.

It is a cyclic number.

It is not a de Polignac number, because 670245421 - 2³ = 670245413 is a prime.

It is a Duffinian number.

670245421 is a modest number, since divided by 245421 gives 670 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670245481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1931370 + ... + 1931716.

It is an arithmetic number, because the mean of its divisors is an integer number (43163136).

Almost surely, 2^670245421 is an apocalyptic number.

It is an amenable number.

670245421 is a deficient number, since it is larger than the sum of its proper divisors (20364755).

670245421 is a wasteful number, since it uses less digits than its factorization.

670245421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 670245421 is about 25889.0984972440. The cubic root of 670245421 is about 875.1408408935.

Adding to 670245421 its reverse (124542076), we get a palindrome (794787497).

The spelling of 670245421 in words is "six hundred seventy million, two hundred forty-five thousand, four hundred twenty-one".