64639296 has 140 divisors (see below), whose sum is σ = 197373748. Its totient is φ = 20901888.

The previous prime is 64639261. The next prime is 64639313. The reversal of 64639296 is 69293646.

64639296 is a `hidden beast` number, since 6 + 4 + 639 + 2 + 9 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 39237696 + 25401600 = 6264^2 + 5040^2 .

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 3.

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 191640 + ... + 191976.

Almost surely, 2^64639296 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 64639296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98686874).

64639296 is an abundant number, since it is smaller than the sum of its proper divisors (132734452).

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

64639296 is a wasteful number, since it uses less digits than its factorization.

64639296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 379 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 64639296 is about 8039.8567151411. The cubic root of 64639296 is about 401.3274564419.

The spelling of 64639296 in words is "sixty-four million, six hundred thirty-nine thousand, two hundred ninety-six".