40878665 has 4 divisors (see below), whose sum is σ = 49054404. Its totient is φ = 32702928.

The previous prime is 40878653. The next prime is 40878697. The reversal of 40878665 is 56687804.

40878665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31685641 + 9193024 = 5629^2 + 3032^2 .

It is a cyclic number.

It is not a de Polignac number, because 40878665 - 2²⁴ = 24101449 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 4087862 + ... + 4087871.

It is an arithmetic number, because the mean of its divisors is an integer number (12263601).

Almost surely, 2^40878665 is an apocalyptic number.

It is an amenable number.

40878665 is a deficient number, since it is larger than the sum of its proper divisors (8175739).

40878665 is an equidigital number, since it uses as much as digits as its factorization.

40878665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8175738.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 40878665 is about 6393.6425455291. The cubic root of 40878665 is about 344.4812339207.

The spelling of 40878665 in words is "forty million, eight hundred seventy-eight thousand, six hundred sixty-five".