64523686 has 4 divisors (see below), whose sum is σ = 96785532. Its totient is φ = 32261842.

The previous prime is 64523647. The next prime is 64523699. The reversal of 64523686 is 68632546.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68632546 = 2 ⋅34316273.

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, 16130920 + ... + 16130923.

It is an arithmetic number, because the mean of its divisors is an integer number (24196383).

Almost surely, 2^64523686 is an apocalyptic number.

64523686 is a deficient number, since it is larger than the sum of its proper divisors (32261846).

64523686 is a wasteful number, since it uses less digits than its factorization.

64523686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32261845.

The product of its digits is 207360, while the sum is 40.

The square root of 64523686 is about 8032.6636926987. The cubic root of 64523686 is about 401.0880501835.

The spelling of 64523686 in words is "sixty-four million, five hundred twenty-three thousand, six hundred eighty-six".