64307776 has 56 divisors (see below), whose sum is σ = 141208760. Its totient is φ = 28864512.

The previous prime is 64307759. The next prime is 64307777. The reversal of 64307776 is 67770346.

It can be written as a sum of positive squares in 4 ways, for example, as 23040000 + 41267776 = 4800^2 + 6424^2 .

It is not an unprimeable number, because it can be changed into a prime (64307777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29740 + ... + 31828.

It is an arithmetic number, because the mean of its divisors is an integer number (2521585).

Almost surely, 2^64307776 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 64307776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70604380).

64307776 is an abundant number, since it is smaller than the sum of its proper divisors (76900984).

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

64307776 is a wasteful number, since it uses less digits than its factorization.

64307776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151 (or 2141 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 40.

The square root of 64307776 is about 8019.2129289600. The cubic root of 64307776 is about 400.6401748937.

The spelling of 64307776 in words is "sixty-four million, three hundred seven thousand, seven hundred seventy-six".