64278857664 has 196 divisors, whose sum is σ = 218564027184. Its totient is φ = 18365294592.

The previous prime is 64278857653. The next prime is 64278857677. The reversal of 64278857664 is 46675887246.

64278857664 is a `hidden beast` number, since 6 + 427 + 8 + 85 + 76 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 228184 + ... + 425000.

Almost surely, 2^64278857664 is an apocalyptic number.

64278857664 is a gapful number since it is divisible by the number (64) 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 64278857664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109282013592).

64278857664 is an abundant number, since it is smaller than the sum of its proper divisors (154285169520).

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

64278857664 is an equidigital number, since it uses as much as digits as its factorization.

64278857664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196854 (or 196829 counting only the distinct ones).

The product of its digits is 108380160, while the sum is 63.

The spelling of 64278857664 in words is "sixty-four billion, two hundred seventy-eight million, eight hundred fifty-seven thousand, six hundred sixty-four".