64688646 has 16 divisors (see below), whose sum is σ = 141139008. Its totient is φ = 19602600.

The previous prime is 64688639. The next prime is 64688651.

64688646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 64688595 and 64688604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 490000 + ... + 490131.

It is an arithmetic number, because the mean of its divisors is an integer number (8821188).

Almost surely, 2^64688646 is an apocalyptic number.

64688646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64688646 is an abundant number, since it is smaller than the sum of its proper divisors (76450362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64688646 is a wasteful number, since it uses less digits than its factorization.

64688646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980147.

The product of its digits is 1327104, while the sum is 48.

The square root of 64688646 is about 8042.9252141245. The cubic root of 64688646 is about 401.4295639474.

The spelling of 64688646 in words is "sixty-four million, six hundred eighty-eight thousand, six hundred forty-six".