64289261784 has 128 divisors (see below), whose sum is σ = 183420288000. Its totient is φ = 18598272000.

The previous prime is 64289261779. The next prime is 64289261819. The reversal of 64289261784 is 48716298246.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 634209 + ... + 728559.

It is an arithmetic number, because the mean of its divisors is an integer number (1432971000).

Almost surely, 2^64289261784 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 64289261784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91710144000).

64289261784 is an abundant number, since it is smaller than the sum of its proper divisors (119131026216).

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

64289261784 is a wasteful number, since it uses less digits than its factorization.

64289261784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94489 (or 94485 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 57.

The spelling of 64289261784 in words is "sixty-four billion, two hundred eighty-nine million, two hundred sixty-one thousand, seven hundred eighty-four".