64563042720 has 384 divisors, whose sum is σ = 238525378560. Its totient is φ = 14511329280.

The previous prime is 64563042689. The next prime is 64563042743. The reversal of 64563042720 is 2724036546.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4708194 + ... + 4721886.

It is an arithmetic number, because the mean of its divisors is an integer number (621159840).

Almost surely, 2^64563042720 is an apocalyptic number.

64563042720 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 64563042720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119262689280).

64563042720 is an abundant number, since it is smaller than the sum of its proper divisors (173962335840).

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

64563042720 is a wasteful number, since it uses less digits than its factorization.

64563042720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13788 (or 13780 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 39.

The spelling of 64563042720 in words is "sixty-four billion, five hundred sixty-three million, forty-two thousand, seven hundred twenty".