64778752 has 40 divisors (see below), whose sum is σ = 136263600. Its totient is φ = 30680064.

The previous prime is 64778731. The next prime is 64778783. The reversal of 64778752 is 25787746.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6399 + ... + 13057.

It is an arithmetic number, because the mean of its divisors is an integer number (3406590).

Almost surely, 2^64778752 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 64778752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68131800).

64778752 is an abundant number, since it is smaller than the sum of its proper divisors (71484848).

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

64778752 is an equidigital number, since it uses as much as digits as its factorization.

64778752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6696 (or 6680 counting only the distinct ones).

The product of its digits is 658560, while the sum is 46.

The square root of 64778752 is about 8048.5248337817. The cubic root of 64778752 is about 401.6158636718.

The spelling of 64778752 in words is "sixty-four million, seven hundred seventy-eight thousand, seven hundred fifty-two".