90643434609 has 32 divisors (see below), whose sum is σ = 152768439040. Its totient is φ = 46519702272.

The previous prime is 90643434589. The next prime is 90643434617.

90643434609 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 90643434609 - 2¹² = 90643430513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90643432609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4476754 + ... + 4496955.

It is an arithmetic number, because the mean of its divisors is an integer number (4774013720).

Almost surely, 2^90643434609 is an apocalyptic number.

It is an amenable number.

90643434609 is a deficient number, since it is larger than the sum of its proper divisors (62125004431).

90643434609 is a wasteful number, since it uses less digits than its factorization.

90643434609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8973769.

The product of its (nonzero) digits is 1679616, while the sum is 48.

The spelling of 90643434609 in words is "ninety billion, six hundred forty-three million, four hundred thirty-four thousand, six hundred nine".