90039521805 has 8 divisors (see below), whose sum is σ = 144063234912. Its totient is φ = 48021078288.

The previous prime is 90039521801. The next prime is 90039521807. The reversal of 90039521805 is 50812593009.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90039521805 - 2² = 90039521801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90039521801) 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 7 ways as a sum of consecutive naturals, for example, 3001317379 + ... + 3001317408.

It is an arithmetic number, because the mean of its divisors is an integer number (18007904364).

Almost surely, 2^90039521805 is an apocalyptic number.

It is an amenable number.

90039521805 is a deficient number, since it is larger than the sum of its proper divisors (54023713107).

90039521805 is a wasteful number, since it uses less digits than its factorization.

90039521805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002634795.

The product of its (nonzero) digits is 97200, while the sum is 42.

The spelling of 90039521805 in words is "ninety billion, thirty-nine million, five hundred twenty-one thousand, eight hundred five".