64402898978880 has 2016 divisors, whose sum is σ = 294652058538240. Its totient is φ = 12743060520960.

The previous prime is 64402898978867. The next prime is 64402898979017. The reversal of 64402898978880 is 8887989820446.

64402898978880 is a `hidden beast` number, since 6 + 440 + 2 + 8 + 9 + 8 + 97 + 8 + 8 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (2016).

It is a self number, because there is not a number n which added to its sum of digits gives 64402898978880.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 8176065502 + ... + 8176073378.

Almost surely, 2^{64402898978880} is an apocalyptic number.

64402898978880 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 64402898978880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147326029269120).

64402898978880 is an abundant number, since it is smaller than the sum of its proper divisors (230249159559360).

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

64402898978880 is a wasteful number, since it uses less digits than its factorization.

64402898978880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8177 (or 8157 counting only the distinct ones).

The product of its (nonzero) digits is 3567255552, while the sum is 81.

The spelling of 64402898978880 in words is "sixty-four trillion, four hundred two billion, eight hundred ninety-eight million, nine hundred seventy-eight thousand, eight hundred eighty".