64163785 has 24 divisors (see below), whose sum is σ = 90489096. Its totient is φ = 43545600.

The previous prime is 64163753. The next prime is 64163819. The reversal of 64163785 is 58736146.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24561936 + 39601849 = 4956^2 + 6293^2 .

It is not a de Polignac number, because 64163785 - 2⁵ = 64163753 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23449 + ... + 26041.

It is an arithmetic number, because the mean of its divisors is an integer number (3770379).

Almost surely, 2^64163785 is an apocalyptic number.

It is an amenable number.

64163785 is a deficient number, since it is larger than the sum of its proper divisors (26325311).

64163785 is a wasteful number, since it uses less digits than its factorization.

64163785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713 (or 2706 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 64163785 is about 8010.2300216660. The cubic root of 64163785 is about 400.3409280875.

It can be divided in two parts, 6416 and 3785, that added together give a palindrome (10201).

The spelling of 64163785 in words is "sixty-four million, one hundred sixty-three thousand, seven hundred eighty-five".