64433983680 has 280 divisors, whose sum is σ = 250040759760. Its totient is φ = 15620290560.

The previous prime is 64433983591. The next prime is 64433983697. The reversal of 64433983680 is 8638933446.

64433983680 is a `hidden beast` number, since 6 + 443 + 3 + 98 + 36 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 172126 + ... + 398114.

Almost surely, 2^64433983680 is an apocalyptic number.

64433983680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64433983680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125020379880).

64433983680 is an abundant number, since it is smaller than the sum of its proper divisors (185606776080).

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

64433983680 is a wasteful number, since it uses less digits than its factorization.

64433983680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226029 (or 226010 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 54.

The spelling of 64433983680 in words is "sixty-four billion, four hundred thirty-three million, nine hundred eighty-three thousand, six hundred eighty".