670235621 has 16 divisors (see below), whose sum is σ = 775219200. Its totient is φ = 573058800.

The previous prime is 670235603. The next prime is 670235627. The reversal of 670235621 is 126532076.

It is a cyclic number.

It is not a de Polignac number, because 670235621 - 2¹⁰ = 670234597 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 (670235627) 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, 17516 + ... + 40586.

It is an arithmetic number, because the mean of its divisors is an integer number (48451200).

Almost surely, 2^670235621 is an apocalyptic number.

It is an amenable number.

670235621 is a deficient number, since it is larger than the sum of its proper divisors (104983579).

670235621 is a wasteful number, since it uses less digits than its factorization.

670235621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23240.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 670235621 is about 25888.9092276983. The cubic root of 670235621 is about 875.1365755793.

Adding to 670235621 its reverse (126532076), we get a palindrome (796767697).

The spelling of 670235621 in words is "six hundred seventy million, two hundred thirty-five thousand, six hundred twenty-one".