670365621 has 24 divisors (see below), whose sum is σ = 997168536. Its totient is φ = 433704960.

The previous prime is 670365569. The next prime is 670365623. The reversal of 670365621 is 126563076.

670365621 is a `hidden beast` number, since 67 + 0 + 36 + 562 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 77686596 + 592679025 = 8814^2 + 24345^2 .

It is not a de Polignac number, because 670365621 - 2⁹ = 670365109 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670365623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66511 + ... + 75923.

It is an arithmetic number, because the mean of its divisors is an integer number (41548689).

Almost surely, 2^670365621 is an apocalyptic number.

It is an amenable number.

670365621 is a deficient number, since it is larger than the sum of its proper divisors (326802915).

670365621 is a wasteful number, since it uses less digits than its factorization.

670365621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9653 (or 9650 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 670365621 is about 25891.4198336051. The cubic root of 670365621 is about 875.1931528965.

The spelling of 670365621 in words is "six hundred seventy million, three hundred sixty-five thousand, six hundred twenty-one".