64684505 has 4 divisors (see below), whose sum is σ = 77621412. Its totient is φ = 51747600.

The previous prime is 64684481. The next prime is 64684517. The reversal of 64684505 is 50548646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50548646 = 2 ⋅25274323.

It can be written as a sum of positive squares in 2 ways, for example, as 11744329 + 52940176 = 3427^2 + 7276^2 .

It is not a de Polignac number, because 64684505 - 2¹⁸ = 64422361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6468446 + ... + 6468455.

It is an arithmetic number, because the mean of its divisors is an integer number (19405353).

Almost surely, 2^64684505 is an apocalyptic number.

It is an amenable number.

64684505 is a deficient number, since it is larger than the sum of its proper divisors (12936907).

64684505 is a wasteful number, since it uses less digits than its factorization.

64684505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12936906.

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 64684505 is about 8042.6677787908. The cubic root of 64684505 is about 401.4209980172.

The spelling of 64684505 in words is "sixty-four million, six hundred eighty-four thousand, five hundred five".