670791021 has 8 divisors (see below), whose sum is σ = 933274560. Its totient is φ = 427750752.

The previous prime is 670791007. The next prime is 670791041. The reversal of 670791021 is 120197076.

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

It is not a de Polignac number, because 670791021 - 2⁶ = 670790957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670791041) 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, 4860736 + ... + 4860873.

It is an arithmetic number, because the mean of its divisors is an integer number (116659320).

Almost surely, 2^670791021 is an apocalyptic number.

It is an amenable number.

670791021 is a deficient number, since it is larger than the sum of its proper divisors (262483539).

670791021 is a wasteful number, since it uses less digits than its factorization.

670791021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9721635.

The product of its (nonzero) digits is 5292, while the sum is 33.

The square root of 670791021 is about 25899.6336074470. The cubic root of 670791021 is about 875.3782401735.

The spelling of 670791021 in words is "six hundred seventy million, seven hundred ninety-one thousand, twenty-one".