40806578 has 6 divisors (see below), whose sum is σ = 61223421. Its totient is φ = 20398772.

The previous prime is 40806559. The next prime is 40806587. The reversal of 40806578 is 87560804.

40806578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 22972849 + 17833729 = 4793^2 + 4223^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=4517.

It is a Duffinian 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 2 ways as a sum of consecutive naturals, for example, 6776 + ... + 11292.

Almost surely, 2^40806578 is an apocalyptic number.

40806578 is a deficient number, since it is larger than the sum of its proper divisors (20416843).

40806578 is an frugal number, since it uses more digits than its factorization.

40806578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9036 (or 4519 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 40806578 is about 6388.0026612393. The cubic root of 40806578 is about 344.2786243202.

The spelling of 40806578 in words is "forty million, eight hundred six thousand, five hundred seventy-eight".