90211738 has 4 divisors (see below), whose sum is σ = 135317610. Its totient is φ = 45105868.

The previous prime is 90211703. The next prime is 90211739. The reversal of 90211738 is 83711209.

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

It can be written as a sum of positive squares in only one way, i.e., 84768849 + 5442889 = 9207^2 + 2333^2 .

It is not an unprimeable number, because it can be changed into a prime (90211739) 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 as a sum of consecutive naturals, namely, 22552933 + ... + 22552936.

Almost surely, 2^90211738 is an apocalyptic number.

90211738 is a deficient number, since it is larger than the sum of its proper divisors (45105872).

90211738 is a wasteful number, since it uses less digits than its factorization.

90211738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45105871.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 90211738 is about 9497.9859970417. The cubic root of 90211738 is about 448.4916378115.

The spelling of 90211738 in words is "ninety million, two hundred eleven thousand, seven hundred thirty-eight".