64641361 has 8 divisors (see below), whose sum is σ = 68527080. Its totient is φ = 60764928.

The previous prime is 64641337. The next prime is 64641383. The reversal of 64641361 is 16314646.

It can be written as a sum of positive squares in 4 ways, for example, as 6027025 + 58614336 = 2455^2 + 7656^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 64641361 - 2¹¹ = 64639313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64641301) 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, 16395 + ... + 19951.

It is an arithmetic number, because the mean of its divisors is an integer number (8565885).

Almost surely, 2^64641361 is an apocalyptic number.

It is an amenable number.

64641361 is a deficient number, since it is larger than the sum of its proper divisors (3885719).

64641361 is a wasteful number, since it uses less digits than its factorization.

64641361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4643.

The product of its digits is 10368, while the sum is 31.

The square root of 64641361 is about 8039.9851368022. The cubic root of 64641361 is about 401.3317300671.

The spelling of 64641361 in words is "sixty-four million, six hundred forty-one thousand, three hundred sixty-one".