90440730493 has 4 divisors (see below), whose sum is σ = 95200768960. Its totient is φ = 85680692028.

The previous prime is 90440730469. The next prime is 90440730503. The reversal of 90440730493 is 39403704409.

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: 39403704409 = 31 ⋅1271087239.

It is a cyclic number.

It is not a de Polignac number, because 90440730493 - 2¹³ = 90440722301 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 (90440730403) 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, 2380019205 + ... + 2380019242.

It is an arithmetic number, because the mean of its divisors is an integer number (23800192240).

Almost surely, 2^90440730493 is an apocalyptic number.

It is an amenable number.

90440730493 is a deficient number, since it is larger than the sum of its proper divisors (4760038467).

90440730493 is a wasteful number, since it uses less digits than its factorization.

90440730493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4760038466.

The product of its (nonzero) digits is 326592, while the sum is 43.

The spelling of 90440730493 in words is "ninety billion, four hundred forty million, seven hundred thirty thousand, four hundred ninety-three".