64449008640 has 704 divisors, whose sum is σ = 239186545920. Its totient is φ = 16444293120.

The previous prime is 64449008639. The next prime is 64449008647. The reversal of 64449008640 is 4680094446.

64449008640 is a `hidden beast` number, since 6 + 44 + 490 + 0 + 86 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64449008647) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 470430652 + ... + 470430788.

Almost surely, 2^64449008640 is an apocalyptic number.

64449008640 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 64449008640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119593272960).

64449008640 is an abundant number, since it is smaller than the sum of its proper divisors (174737537280).

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

64449008640 is a wasteful number, since it uses less digits than its factorization.

64449008640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 64449008640 in words is "sixty-four billion, four hundred forty-nine million, eight thousand, six hundred forty".