90608368909 has 4 divisors (see below), whose sum is σ = 91849579516. Its totient is φ = 89367158304.

The previous prime is 90608368889. The next prime is 90608368913. The reversal of 90608368909 is 90986380609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90986380609 = 241 ⋅377536849.

It can be written as a sum of positive squares in 2 ways, for example, as 59518921225 + 31089447684 = 243965^2 + 176322^2 .

It is a de Polignac number, because none of the positive numbers 2^k-90608368909 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 (90608366909) 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, 620605194 + ... + 620605339.

It is an arithmetic number, because the mean of its divisors is an integer number (22962394879).

Almost surely, 2^90608368909 is an apocalyptic number.

It is an amenable number.

90608368909 is a deficient number, since it is larger than the sum of its proper divisors (1241210607).

90608368909 is a wasteful number, since it uses less digits than its factorization.

90608368909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241210606.

The product of its (nonzero) digits is 5038848, while the sum is 58.

The spelling of 90608368909 in words is "ninety billion, six hundred eight million, three hundred sixty-eight thousand, nine hundred nine".