56640061 has 8 divisors (see below), whose sum is σ = 57211704. Its totient is φ = 56071680.

The previous prime is 56640049. The next prime is 56640097. The reversal of 56640061 is 16004665.

It can be written as a sum of positive squares in 4 ways, for example, as 32137561 + 24502500 = 5669^2 + 4950^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56640061 - 2⁹ = 56639549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56640011) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 46881 + ... + 48073.

It is an arithmetic number, because the mean of its divisors is an integer number (7151463).

Almost surely, 2^56640061 is an apocalyptic number.

It is an amenable number.

56640061 is a deficient number, since it is larger than the sum of its proper divisors (571643).

56640061 is a wasteful number, since it uses less digits than its factorization.

56640061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 56640061 is about 7525.9591415314. The cubic root of 56640061 is about 384.0383285128.

The spelling of 56640061 in words is "fifty-six million, six hundred forty thousand, sixty-one".