64838661 has 4 divisors (see below), whose sum is σ = 86451552. Its totient is φ = 43225772.

The previous prime is 64838611. The next prime is 64838681. The reversal of 64838661 is 16683846.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64838661 - 2⁷ = 64838533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64838611) 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, 10806441 + ... + 10806446.

It is an arithmetic number, because the mean of its divisors is an integer number (21612888).

Almost surely, 2^64838661 is an apocalyptic number.

It is an amenable number.

64838661 is a deficient number, since it is larger than the sum of its proper divisors (21612891).

64838661 is a wasteful number, since it uses less digits than its factorization.

64838661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21612890.

The product of its digits is 165888, while the sum is 42.

The square root of 64838661 is about 8052.2457116012. The cubic root of 64838661 is about 401.7396336356.

The spelling of 64838661 in words is "sixty-four million, eight hundred thirty-eight thousand, six hundred sixty-one".