90517659769840 has 20 divisors (see below), whose sum is σ = 210453558965064. Its totient is φ = 36207063907904.

The previous prime is 90517659769787. The next prime is 90517659769897. The reversal of 90517659769840 is 4896795671509.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565735373482 + ... + 565735373641.

Almost surely, 2^{90517659769840} is an apocalyptic number.

It is an amenable number.

90517659769840 is an abundant number, since it is smaller than the sum of its proper divisors (119935899195224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90517659769840 is a wasteful number, since it uses less digits than its factorization.

90517659769840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131470747136 (or 1131470747130 counting only the distinct ones).

The product of its (nonzero) digits is 1028764800, while the sum is 76.

The spelling of 90517659769840 in words is "ninety trillion, five hundred seventeen billion, six hundred fifty-nine million, seven hundred sixty-nine thousand, eight hundred forty".