64434272256 has 384 divisors, whose sum is σ = 198215035200. Its totient is φ = 20667432960.

The previous prime is 64434272249. The next prime is 64434272281. The reversal of 64434272256 is 65227243446.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219912046 + ... + 219912338.

Almost surely, 2^64434272256 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 64434272256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99107517600).

64434272256 is an abundant number, since it is smaller than the sum of its proper divisors (133780762944).

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

64434272256 is a wasteful number, since it uses less digits than its factorization.

64434272256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 436 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 45.

The spelling of 64434272256 in words is "sixty-four billion, four hundred thirty-four million, two hundred seventy-two thousand, two hundred fifty-six".