64499227520 has 512 divisors, whose sum is σ = 199874304000. Its totient is φ = 19344162816.

The previous prime is 64499227517. The next prime is 64499227561. The reversal of 64499227520 is 2572299446.

It is a congruent number.

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, 239773946 + ... + 239774214.

It is an arithmetic number, because the mean of its divisors is an integer number (390379500).

Almost surely, 2^64499227520 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 64499227520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99937152000).

64499227520 is an abundant number, since it is smaller than the sum of its proper divisors (135375076480).

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

64499227520 is a wasteful number, since it uses less digits than its factorization.

64499227520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 64499227520 in words is "sixty-four billion, four hundred ninety-nine million, two hundred twenty-seven thousand, five hundred twenty".