64836481 has 4 divisors (see below), whose sum is σ = 64944964. Its totient is φ = 64728000.

The previous prime is 64836467. The next prime is 64836523. The reversal of 64836481 is 18463846.

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 35892081 + 28944400 = 5991^2 + 5380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64836481 is a prime.

It is a super-2 number, since 2×64836481² = 8407538536926722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64836451) 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, 53340 + ... + 54541.

It is an arithmetic number, because the mean of its divisors is an integer number (16236241).

Almost surely, 2^64836481 is an apocalyptic number.

It is an amenable number.

64836481 is a deficient number, since it is larger than the sum of its proper divisors (108483).

64836481 is a wasteful number, since it uses less digits than its factorization.

64836481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108482.

The product of its digits is 110592, while the sum is 40.

The square root of 64836481 is about 8052.1103444998. The cubic root of 64836481 is about 401.7351311664.

The spelling of 64836481 in words is "sixty-four million, eight hundred thirty-six thousand, four hundred eighty-one".