90780838 has 16 divisors (see below), whose sum is σ = 139041360. Its totient is φ = 44437536.

The previous prime is 90780797. The next prime is 90780887. The reversal of 90780838 is 83808709.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 90780794 and 90780803.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 90556 + ... + 91552.

It is an arithmetic number, because the mean of its divisors is an integer number (8690085).

Almost surely, 2^90780838 is an apocalyptic number.

90780838 is a deficient number, since it is larger than the sum of its proper divisors (48260522).

90780838 is a wasteful number, since it uses less digits than its factorization.

90780838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 90780838 is about 9527.8978793856. The cubic root of 90780838 is about 449.4327634736.

The spelling of 90780838 in words is "ninety million, seven hundred eighty thousand, eight hundred thirty-eight".