90809543 has 8 divisors (see below), whose sum is σ = 103372416. Its totient is φ = 78964600.

The previous prime is 90809539. The next prime is 90809549. The reversal of 90809543 is 34590809.

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

It is not a de Polignac number, because 90809543 - 2² = 90809539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90809497 and 90809506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90809549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179213 + ... + 179718.

It is an arithmetic number, because the mean of its divisors is an integer number (12921552).

Almost surely, 2^90809543 is an apocalyptic number.

90809543 is a deficient number, since it is larger than the sum of its proper divisors (12562873).

90809543 is a wasteful number, since it uses less digits than its factorization.

90809543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358965.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 90809543 is about 9529.4041261770. The cubic root of 90809543 is about 449.4801288583.

The spelling of 90809543 in words is "ninety million, eight hundred nine thousand, five hundred forty-three".