90506643 has 4 divisors (see below), whose sum is σ = 120675528. Its totient is φ = 60337760.

The previous prime is 90506629. The next prime is 90506659. The reversal of 90506643 is 34660509.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 90506643 - 2⁴ = 90506627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90506243) 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, 15084438 + ... + 15084443.

It is an arithmetic number, because the mean of its divisors is an integer number (30168882).

Almost surely, 2^90506643 is an apocalyptic number.

90506643 is a deficient number, since it is larger than the sum of its proper divisors (30168885).

90506643 is a wasteful number, since it uses less digits than its factorization.

90506643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30168884.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 90506643 is about 9513.4979371417. The cubic root of 90506643 is about 448.9798173146.

The spelling of 90506643 in words is "ninety million, five hundred six thousand, six hundred forty-three".