64523641 has 12 divisors (see below), whose sum is σ = 80832612. Its totient is φ = 51051168.

The previous prime is 64523633. The next prime is 64523647. The reversal of 64523641 is 14632546.

It can be written as a sum of positive squares in 2 ways, for example, as 42198016 + 22325625 = 6496^2 + 4725^2 .

It is not a de Polignac number, because 64523641 - 2³ = 64523633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64523647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50010 + ... + 51283.

It is an arithmetic number, because the mean of its divisors is an integer number (6736051).

Almost surely, 2^64523641 is an apocalyptic number.

It is an amenable number.

64523641 is a deficient number, since it is larger than the sum of its proper divisors (16308971).

64523641 is a wasteful number, since it uses less digits than its factorization.

64523641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101320 (or 101313 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 64523641 is about 8032.6608916349. The cubic root of 64523641 is about 401.0879569414.

The spelling of 64523641 in words is "sixty-four million, five hundred twenty-three thousand, six hundred forty-one".