64399548240 has 240 divisors, whose sum is σ = 229791573648. Its totient is φ = 16106962944.

The previous prime is 64399548221. The next prime is 64399548287. The reversal of 64399548240 is 4284599346.

64399548240 is a `hidden beast` number, since 6 + 4 + 3 + 99 + 548 + 2 + 4 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 29126200896 + 35273347344 = 170664^2 + 187812^2 .

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3577342 + ... + 3595298.

Almost surely, 2^64399548240 is an apocalyptic number.

64399548240 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 64399548240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114895786824).

64399548240 is an abundant number, since it is smaller than the sum of its proper divisors (165392025408).

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

64399548240 is a wasteful number, since it uses less digits than its factorization.

64399548240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18286 (or 18277 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 54.

The spelling of 64399548240 in words is "sixty-four billion, three hundred ninety-nine million, five hundred forty-eight thousand, two hundred forty".