90681789 has 16 divisors (see below), whose sum is σ = 136157184. Its totient is φ = 53185200.

The previous prime is 90681779. The next prime is 90681803. The reversal of 90681789 is 98718609.

It is a happy number.

It is not a de Polignac number, because 90681789 - 2⁹ = 90681277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90681719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43299 + ... + 45344.

It is an arithmetic number, because the mean of its divisors is an integer number (8509824).

Almost surely, 2^90681789 is an apocalyptic number.

It is an amenable number.

90681789 is a deficient number, since it is larger than the sum of its proper divisors (45475395).

90681789 is a wasteful number, since it uses less digits than its factorization.

90681789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88688.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 90681789 is about 9522.6986196141. The cubic root of 90681789 is about 449.2692485487.

The spelling of 90681789 in words is "ninety million, six hundred eighty-one thousand, seven hundred eighty-nine".