52640385 has 64 divisors (see below), whose sum is σ = 100362240. Its totient is φ = 23063040.

The previous prime is 52640363. The next prime is 52640389. The reversal of 52640385 is 58304625.

It is not a de Polignac number, because 52640385 - 2⁸ = 52640129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (52640389) 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 63 ways as a sum of consecutive naturals, for example, 401770 + ... + 401900.

It is an arithmetic number, because the mean of its divisors is an integer number (1568160).

Almost surely, 2^52640385 is an apocalyptic number.

It is an amenable number.

52640385 is a deficient number, since it is larger than the sum of its proper divisors (47721855).

52640385 is a wasteful number, since it uses less digits than its factorization.

52640385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 52640385 is about 7255.3693910097. The cubic root of 52640385 is about 374.7770763953. Note that the first 3 decimals are identical.

The spelling of 52640385 in words is "fifty-two million, six hundred forty thousand, three hundred eighty-five".