64912816 has 40 divisors (see below), whose sum is σ = 134406080. Its totient is φ = 30279744.

The previous prime is 64912807. The next prime is 64912823. The reversal of 64912816 is 61821946.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18775 + ... + 21961.

It is an arithmetic number, because the mean of its divisors is an integer number (3360152).

Almost surely, 2^64912816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64912816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67203040).

64912816 is an abundant number, since it is smaller than the sum of its proper divisors (69493264).

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

64912816 is a wasteful number, since it uses less digits than its factorization.

64912816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281 (or 3275 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 64912816 is about 8056.8490118656. The cubic root of 64912816 is about 401.8927298085.

The spelling of 64912816 in words is "sixty-four million, nine hundred twelve thousand, eight hundred sixteen".