64993856 has 112 divisors (see below), whose sum is σ = 147474432. Its totient is φ = 28262400.

The previous prime is 64993849. The next prime is 64993879. The reversal of 64993856 is 65839946.

It is a zygodrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1382825 + ... + 1382871.

It is an arithmetic number, because the mean of its divisors is an integer number (1316736).

Almost surely, 2^64993856 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 64993856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73737216).

64993856 is an abundant number, since it is smaller than the sum of its proper divisors (82480576).

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

64993856 is a wasteful number, since it uses less digits than its factorization.

64993856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 138 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 50.

The square root of 64993856 is about 8061.8767045893. The cubic root of 64993856 is about 402.0599070807.

The spelling of 64993856 in words is "sixty-four million, nine hundred ninety-three thousand, eight hundred fifty-six".