670988393 has 2 divisors, whose sum is σ = 670988394. Its totient is φ = 670988392.

The previous prime is 670988389. The next prime is 670988431. The reversal of 670988393 is 393889076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 637209049 + 33779344 = 25243^2 + 5812^2 .

It is a cyclic number.

It is not a de Polignac number, because 670988393 - 2² = 670988389 is a prime.

It is not a weakly prime, because it can be changed into another prime (670988993) 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 as a sum of consecutive naturals, namely, 335494196 + 335494197.

It is an arithmetic number, because the mean of its divisors is an integer number (335494197).

Almost surely, 2^670988393 is an apocalyptic number.

It is an amenable number.

670988393 is a deficient number, since it is larger than the sum of its proper divisors (1).

670988393 is an equidigital number, since it uses as much as digits as its factorization.

670988393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 670988393 is about 25903.4436513758. The cubic root of 670988393 is about 875.4640881777.

The spelling of 670988393 in words is "six hundred seventy million, nine hundred eighty-eight thousand, three hundred ninety-three".