64897933409280 has 792 divisors, whose sum is σ = 235170310401936. Its totient is φ = 16545135329280.

The previous prime is 64897933409219. The next prime is 64897933409299. The reversal of 64897933409280 is 8290433979846.

64897933409280 is a `hidden beast` number, since 6 + 4 + 8 + 9 + 7 + 9 + 334 + 0 + 9 + 280 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 64897933409199 and 64897933409208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3675470212 + ... + 3675487868.

Almost surely, 2^{64897933409280} is an apocalyptic number.

64897933409280 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 64897933409280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117585155200968).

64897933409280 is an abundant number, since it is smaller than the sum of its proper divisors (170272376992656).

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

64897933409280 is a wasteful number, since it uses less digits than its factorization.

64897933409280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17833 (or 17781 counting only the distinct ones).

The product of its (nonzero) digits is 564350976, while the sum is 72.

The spelling of 64897933409280 in words is "sixty-four trillion, eight hundred ninety-seven billion, nine hundred thirty-three million, four hundred nine thousand, two hundred eighty".