90808642 has 16 divisors (see below), whose sum is σ = 138482712. Its totient is φ = 44651520.

The previous prime is 90808631. The next prime is 90808649. The reversal of 90808642 is 24680809.

It can be written as a sum of positive squares in 4 ways, for example, as 81018001 + 9790641 = 9001^2 + 3129^2 .

It is not an unprimeable number, because it can be changed into a prime (90808649) 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 in 7 ways as a sum of consecutive naturals, for example, 66042 + ... + 67402.

Almost surely, 2^90808642 is an apocalyptic number.

90808642 is a deficient number, since it is larger than the sum of its proper divisors (47674070).

90808642 is a wasteful number, since it uses less digits than its factorization.

90808642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 90808642 is about 9529.3568513305. The cubic root of 90808642 is about 449.4786422930.

The spelling of 90808642 in words is "ninety million, eight hundred eight thousand, six hundred forty-two".