64863686 has 4 divisors (see below), whose sum is σ = 97295532. Its totient is φ = 32431842.

The previous prime is 64863647. The next prime is 64863697. The reversal of 64863686 is 68636846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68636846 = 2 ⋅34318423.

It is a self number, because there is not a number n which added to its sum of digits gives 64863686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16215920 + ... + 16215923.

It is an arithmetic number, because the mean of its divisors is an integer number (24323883).

Almost surely, 2^64863686 is an apocalyptic number.

64863686 is a deficient number, since it is larger than the sum of its proper divisors (32431846).

64863686 is a wasteful number, since it uses less digits than its factorization.

64863686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32431845.

The product of its digits is 995328, while the sum is 47.

The square root of 64863686 is about 8053.7994760237. The cubic root of 64863686 is about 401.7913118629.

The spelling of 64863686 in words is "sixty-four million, eight hundred sixty-three thousand, six hundred eighty-six".