672389657 has 2 divisors, whose sum is σ = 672389658. Its totient is φ = 672389656.

The previous prime is 672389629. The next prime is 672389671. The reversal of 672389657 is 756983276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668687881 + 3701776 = 25859^2 + 1924^2 .

It is a cyclic number.

It is not a de Polignac number, because 672389657 - 2¹⁸ = 672127513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 672389599 and 672389608.

It is not a weakly prime, because it can be changed into another prime (672389617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336194828 + 336194829.

It is an arithmetic number, because the mean of its divisors is an integer number (336194829).

Almost surely, 2^672389657 is an apocalyptic number.

It is an amenable number.

672389657 is a deficient number, since it is larger than the sum of its proper divisors (1).

672389657 is an equidigital number, since it uses as much as digits as its factorization.

672389657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 53.

The square root of 672389657 is about 25930.4773770172. The cubic root of 672389657 is about 876.0730919218.

The spelling of 672389657 in words is "six hundred seventy-two million, three hundred eighty-nine thousand, six hundred fifty-seven".