90205988478679 has 24 divisors (see below), whose sum is σ = 102684402903600. Its totient is φ = 78924011443200.

The previous prime is 90205988478653. The next prime is 90205988478691. The reversal of 90205988478679 is 97687488950209.

It is not a de Polignac number, because 90205988478679 - 2⁹ = 90205988478167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90205988470679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154446922 + ... + 155029879.

It is an arithmetic number, because the mean of its divisors is an integer number (4278516787650).

Almost surely, 2^{90205988478679} is an apocalyptic number.

90205988478679 is a deficient number, since it is larger than the sum of its proper divisors (12478414424921).

90205988478679 is a wasteful number, since it uses less digits than its factorization.

90205988478679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309476895 (or 309476872 counting only the distinct ones).

The product of its (nonzero) digits is 4389396480, while the sum is 82.

The spelling of 90205988478679 in words is "ninety trillion, two hundred five billion, nine hundred eighty-eight million, four hundred seventy-eight thousand, six hundred seventy-nine".