670003681 has 4 divisors (see below), whose sum is σ = 674500500. Its totient is φ = 665506864.

The previous prime is 670003667. The next prime is 670003699. The reversal of 670003681 is 186300076.

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 256288081 + 413715600 = 16009^2 + 20340^2 .

It is a cyclic number.

It is not a de Polignac number, because 670003681 - 2²⁵ = 636449249 is a prime.

It is a super-2 number, since 2×670003681² = 897809865107099522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170003681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2248186 + ... + 2248483.

It is an arithmetic number, because the mean of its divisors is an integer number (168625125).

Almost surely, 2^670003681 is an apocalyptic number.

It is an amenable number.

670003681 is a deficient number, since it is larger than the sum of its proper divisors (4496819).

670003681 is a wasteful number, since it uses less digits than its factorization.

670003681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496818.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 670003681 is about 25884.4293157102. The cubic root of 670003681 is about 875.0356147681.

The spelling of 670003681 in words is "six hundred seventy million, three thousand, six hundred eighty-one".