64187378248 has 128 divisors (see below), whose sum is σ = 145360396800. Its totient is φ = 25978208256.

The previous prime is 64187378243. The next prime is 64187378249. The reversal of 64187378248 is 84287378146.

It is a junction number, because it is equal to n+sod(n) for n = 64187378192 and 64187378201.

It is not an unprimeable number, because it can be changed into a prime (64187378243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45554568 + ... + 45555976.

It is an arithmetic number, because the mean of its divisors is an integer number (1135628100).

Almost surely, 2^64187378248 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 64187378248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72680198400).

64187378248 is an abundant number, since it is smaller than the sum of its proper divisors (81173018552).

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

64187378248 is a wasteful number, since it uses less digits than its factorization.

64187378248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871 (or 1867 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 58.

The spelling of 64187378248 in words is "sixty-four billion, one hundred eighty-seven million, three hundred seventy-eight thousand, two hundred forty-eight".