61005865 has 16 divisors (see below), whose sum is σ = 77267520. Its totient is φ = 46111680.

The previous prime is 61005839. The next prime is 61005907. The reversal of 61005865 is 56850016.

It is not a de Polignac number, because 61005865 - 2⁹ = 61005353 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 50802 + ... + 51988.

It is an arithmetic number, because the mean of its divisors is an integer number (4829220).

Almost surely, 2^61005865 is an apocalyptic number.

It is an amenable number.

61005865 is a deficient number, since it is larger than the sum of its proper divisors (16261655).

61005865 is a wasteful number, since it uses less digits than its factorization.

61005865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 61005865 is about 7810.6251350324. The cubic root of 61005865 is about 393.6623340567.

The spelling of 61005865 in words is "sixty-one million, five thousand, eight hundred sixty-five".