90505547 has 4 divisors (see below), whose sum is σ = 98733336. Its totient is φ = 82277760.

The previous prime is 90505537. The next prime is 90505561. The reversal of 90505547 is 74550509.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90505547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90505537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4113878 + ... + 4113899.

It is an arithmetic number, because the mean of its divisors is an integer number (24683334).

Almost surely, 2^90505547 is an apocalyptic number.

90505547 is a deficient number, since it is larger than the sum of its proper divisors (8227789).

90505547 is a wasteful number, since it uses less digits than its factorization.

90505547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8227788.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 90505547 is about 9513.4403346003. The cubic root of 90505547 is about 448.9780049840.

The spelling of 90505547 in words is "ninety million, five hundred five thousand, five hundred forty-seven".