90780442 has 16 divisors (see below), whose sum is σ = 151770240. Its totient is φ = 40471488.

The previous prime is 90780419. The next prime is 90780463. The reversal of 90780442 is 24408709.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 90780398 and 90780407.

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, 69618 + ... + 70909.

It is an arithmetic number, because the mean of its divisors is an integer number (9485640).

Almost surely, 2^90780442 is an apocalyptic number.

90780442 is a deficient number, since it is larger than the sum of its proper divisors (60989798).

90780442 is a wasteful number, since it uses less digits than its factorization.

90780442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140565.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 90780442 is about 9527.8770982838. The cubic root of 90780442 is about 449.4321099743.

The spelling of 90780442 in words is "ninety million, seven hundred eighty thousand, four hundred forty-two".