64827689 has 8 divisors (see below), whose sum is σ = 66636360. Its totient is φ = 63043200.

The previous prime is 64827667. The next prime is 64827691. The reversal of 64827689 is 98672846.

It can be written as a sum of positive squares in 4 ways, for example, as 2544025 + 62283664 = 1595^2 + 7892^2 .

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 64827689 - 2²⁰ = 63779113 is a prime.

It is a super-2 number, since 2×64827689² = 8405258522161442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64827619) 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, 542 + ... + 11399.

It is an arithmetic number, because the mean of its divisors is an integer number (8329545).

Almost surely, 2^64827689 is an apocalyptic number.

It is an amenable number.

64827689 is a deficient number, since it is larger than the sum of its proper divisors (1808671).

64827689 is a wasteful number, since it uses less digits than its factorization.

64827689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12091.

The product of its digits is 1161216, while the sum is 50.

The square root of 64827689 is about 8051.5643821558. The cubic root of 64827689 is about 401.7169715600.

The spelling of 64827689 in words is "sixty-four million, eight hundred twenty-seven thousand, six hundred eighty-nine".