90286649993 has 4 divisors (see below), whose sum is σ = 95038578960. Its totient is φ = 85534721028.

The previous prime is 90286649989. The next prime is 90286650007. The reversal of 90286649993 is 39994668209.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39994668209 = 43 ⋅930108563.

It is a cyclic number.

It is not a de Polignac number, because 90286649993 - 2² = 90286649989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90286649393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2375964455 + ... + 2375964492.

It is an arithmetic number, because the mean of its divisors is an integer number (23759644740).

Almost surely, 2^90286649993 is an apocalyptic number.

It is an amenable number.

90286649993 is a deficient number, since it is larger than the sum of its proper divisors (4751928967).

90286649993 is a wasteful number, since it uses less digits than its factorization.

90286649993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4751928966.

The product of its (nonzero) digits is 45349632, while the sum is 65.

The spelling of 90286649993 in words is "ninety billion, two hundred eighty-six million, six hundred forty-nine thousand, nine hundred ninety-three".