64308728 has 16 divisors (see below), whose sum is σ = 131540760. Its totient is φ = 29231200.

The previous prime is 64308719. The next prime is 64308731. The reversal of 64308728 is 82780346.

It is a super-2 number, since 2×64308728² = 8271224993955968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64308691 and 64308700.

It is a congruent 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, 365303 + ... + 365478.

Almost surely, 2^64308728 is an apocalyptic number.

It is an amenable number.

64308728 is an abundant number, since it is smaller than the sum of its proper divisors (67232032).

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

64308728 is a wasteful number, since it uses less digits than its factorization.

64308728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730798 (or 730794 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 64308728 is about 8019.2722861866. The cubic root of 64308728 is about 400.6421518841.

The spelling of 64308728 in words is "sixty-four million, three hundred eight thousand, seven hundred twenty-eight".