64641231 has 24 divisors (see below), whose sum is σ = 96784896. Its totient is φ = 41530320.

The previous prime is 64641229. The next prime is 64641253. The reversal of 64641231 is 13214646.

64641231 is a `hidden beast` number, since 646 + 4 + 12 + 3 + 1 = 666.

It is not a de Polignac number, because 64641231 - 2¹ = 64641229 is a prime.

It is a super-2 number, since 2×64641231² = 8356977490390722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64641195 and 64641204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64641931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123336 + ... + 123858.

It is an arithmetic number, because the mean of its divisors is an integer number (4032704).

Almost surely, 2^64641231 is an apocalyptic number.

64641231 is a deficient number, since it is larger than the sum of its proper divisors (32143665).

64641231 is a wasteful number, since it uses less digits than its factorization.

64641231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003 (or 1000 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 64641231 is about 8039.9770522061. The cubic root of 64641231 is about 401.3314610280.

Adding to 64641231 its reverse (13214646), we get a palindrome (77855877).

The spelling of 64641231 in words is "sixty-four million, six hundred forty-one thousand, two hundred thirty-one".