90305447 has 2 divisors, whose sum is σ = 90305448. Its totient is φ = 90305446.

The previous prime is 90305393. The next prime is 90305477. The reversal of 90305447 is 74450309.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90305447 - 2¹⁴ = 90289063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90305477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45152723 + 45152724.

It is an arithmetic number, because the mean of its divisors is an integer number (45152724).

Almost surely, 2^90305447 is an apocalyptic number.

90305447 is a deficient number, since it is larger than the sum of its proper divisors (1).

90305447 is an equidigital number, since it uses as much as digits as its factorization.

90305447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 90305447 is about 9502.9178150713. The cubic root of 90305447 is about 448.6468768816.

The spelling of 90305447 in words is "ninety million, three hundred five thousand, four hundred forty-seven".