64849678336 has 117 divisors (see below), whose sum is σ = 136355241169. Its totient is φ = 30835785728.

The previous prime is 64849678331. The next prime is 64849678351. The reversal of 64849678336 is 63387694846.

The square root of 64849678336 is 254656.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 58990694400 + 5858983936 = 242880^2 + 76544^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64849678331) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 374853546 + ... + 374853718.

Almost surely, 2^64849678336 is an apocalyptic number.

64849678336 is the 254656-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64849678336

64849678336 is an abundant number, since it is smaller than the sum of its proper divisors (71505562833).

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

64849678336 is an frugal number, since it uses more digits than its factorization.

64849678336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 198 counting only the distinct ones).

The product of its digits is 125411328, while the sum is 64.

Multiplying 64849678336 by its sum of digits (64), we get a square (4150379413504 = 2037248²).

64849678336 divided by its sum of digits (64) gives a square (1013276224 = 31832²).

The spelling of 64849678336 in words is "sixty-four billion, eight hundred forty-nine million, six hundred seventy-eight thousand, three hundred thirty-six".