90688648 has 8 divisors (see below), whose sum is σ = 170041230. Its totient is φ = 45344320.

The previous prime is 90688643. The next prime is 90688649. The reversal of 90688648 is 84688609.

It can be written as a sum of positive squares in only one way, i.e., 90668484 + 20164 = 9522^2 + 142^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (90688643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5668033 + ... + 5668048.

Almost surely, 2^90688648 is an apocalyptic number.

It is an amenable number.

90688648 is a deficient number, since it is larger than the sum of its proper divisors (79352582).

90688648 is a wasteful number, since it uses less digits than its factorization.

90688648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11336087 (or 11336083 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 49.

The square root of 90688648 is about 9523.0587523127. The cubic root of 90688648 is about 449.2805755569.

The spelling of 90688648 in words is "ninety million, six hundred eighty-eight thousand, six hundred forty-eight".