670673681 has 4 divisors (see below), whose sum is σ = 710125092. Its totient is φ = 631222272.

The previous prime is 670673671. The next prime is 670673683. The reversal of 670673681 is 186376076.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 189310081 + 481363600 = 13759^2 + 21940^2 .

It is a cyclic number.

It is not a de Polignac number, because 670673681 - 2²⁶ = 603564817 is a prime.

It is a super-2 number, since 2×670673681² = 899606372772179522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670673683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19725680 + ... + 19725713.

It is an arithmetic number, because the mean of its divisors is an integer number (177531273).

Almost surely, 2^670673681 is an apocalyptic number.

It is an amenable number.

670673681 is a deficient number, since it is larger than the sum of its proper divisors (39451411).

670673681 is a wasteful number, since it uses less digits than its factorization.

670673681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39451410.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 670673681 is about 25897.3682253622. The cubic root of 670673681 is about 875.3271945327.

The spelling of 670673681 in words is "six hundred seventy million, six hundred seventy-three thousand, six hundred eighty-one".