64634321 has 4 divisors (see below), whose sum is σ = 64962612. Its totient is φ = 64306032.

The previous prime is 64634299. The next prime is 64634329. The reversal of 64634321 is 12343646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44742721 + 19891600 = 6689^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 64634321 - 2¹⁴ = 64617937 is a prime.

It is a super-2 number, since 2×64634321² = 8355190902262082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64634329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163850 + ... + 164243.

It is an arithmetic number, because the mean of its divisors is an integer number (16240653).

Almost surely, 2^64634321 is an apocalyptic number.

It is an amenable number.

64634321 is a deficient number, since it is larger than the sum of its proper divisors (328291).

64634321 is a wasteful number, since it uses less digits than its factorization.

64634321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328290.

The product of its digits is 10368, while the sum is 29.

The square root of 64634321 is about 8039.5473131265. The cubic root of 64634321 is about 401.3171600461.

Adding to 64634321 its reverse (12343646), we get a palindrome (76977967).

The spelling of 64634321 in words is "sixty-four million, six hundred thirty-four thousand, three hundred twenty-one".