64163885 has 8 divisors (see below), whose sum is σ = 77388696. Its totient is φ = 51069760.

The previous prime is 64163881. The next prime is 64163903. The reversal of 64163885 is 58836146.

It can be written as a sum of positive squares in 4 ways, for example, as 41705764 + 22458121 = 6458^2 + 4739^2 .

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

It is not a de Polignac number, because 64163885 - 2² = 64163881 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 (64163881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31586 + ... + 33555.

It is an arithmetic number, because the mean of its divisors is an integer number (9673587).

Almost surely, 2^64163885 is an apocalyptic number.

It is an amenable number.

64163885 is a deficient number, since it is larger than the sum of its proper divisors (13224811).

64163885 is a wasteful number, since it uses less digits than its factorization.

64163885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65343.

The product of its digits is 138240, while the sum is 41.

The square root of 64163885 is about 8010.2362636816. The cubic root of 64163885 is about 400.3411360661.

It can be divided in two parts, 6416 and 3885, that added together give a palindrome (10301).

The spelling of 64163885 in words is "sixty-four million, one hundred sixty-three thousand, eight hundred eighty-five".