90636433 has 4 divisors (see below), whose sum is σ = 90764980. Its totient is φ = 90507888.

The previous prime is 90636431. The next prime is 90636439. The reversal of 90636433 is 33463609.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18861649 + 71774784 = 4343^2 + 8472^2 .

It is a cyclic number.

It is not a de Polignac number, because 90636433 - 2¹ = 90636431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90636431) 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, 63210 + ... + 64627.

It is an arithmetic number, because the mean of its divisors is an integer number (22691245).

Almost surely, 2^90636433 is an apocalyptic number.

It is an amenable number.

90636433 is a deficient number, since it is larger than the sum of its proper divisors (128547).

90636433 is a wasteful number, since it uses less digits than its factorization.

90636433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128546.

The product of its (nonzero) digits is 34992, while the sum is 34.

The square root of 90636433 is about 9520.3168539708. The cubic root of 90636433 is about 449.1943329032.

The spelling of 90636433 in words is "ninety million, six hundred thirty-six thousand, four hundred thirty-three".