87672421409 has 2 divisors, whose sum is σ = 87672421410. Its totient is φ = 87672421408.

The previous prime is 87672421393. The next prime is 87672421423. The reversal of 87672421409 is 90412427678.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84970501009 + 2701920400 = 291497^2 + 51980^2 .

It is a cyclic number.

It is not a de Polignac number, because 87672421409 - 2⁴ = 87672421393 is a prime.

It is not a weakly prime, because it can be changed into another prime (87672451409) 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, 43836210704 + 43836210705.

It is an arithmetic number, because the mean of its divisors is an integer number (43836210705).

Almost surely, 2^87672421409 is an apocalyptic number.

It is an amenable number.

87672421409 is a deficient number, since it is larger than the sum of its proper divisors (1).

87672421409 is an equidigital number, since it uses as much as digits as its factorization.

87672421409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 87672421409 in words is "eighty-seven billion, six hundred seventy-two million, four hundred twenty-one thousand, four hundred nine".