64193478780 has 96 divisors (see below), whose sum is σ = 185632634880. Its totient is φ = 16557776640.

The previous prime is 64193478773. The next prime is 64193478803. The reversal of 64193478780 is 8787439146.

It is a self number, because there is not a number n which added to its sum of digits gives 64193478780.

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 31 ways as a sum of consecutive naturals, for example, 4287267 + ... + 4302213.

It is an arithmetic number, because the mean of its divisors is an integer number (1933673280).

Almost surely, 2^64193478780 is an apocalyptic number.

64193478780 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 64193478780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92816317440).

64193478780 is an abundant number, since it is smaller than the sum of its proper divisors (121439156100).

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

64193478780 is a wasteful number, since it uses less digits than its factorization.

64193478780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17299 (or 17297 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 57.

The spelling of 64193478780 in words is "sixty-four billion, one hundred ninety-three million, four hundred seventy-eight thousand, seven hundred eighty".