5378781640 has 64 divisors (see below), whose sum is σ = 12826686960. Its totient is φ = 2022973440.

The previous prime is 5378781613. The next prime is 5378781671. The reversal of 5378781640 is 461878735.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2914056324 + 2464725316 = 53982^2 + 49646^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 821580 + ... + 828100.

Almost surely, 2^5378781640 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 5378781640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6413343480).

5378781640 is an abundant number, since it is smaller than the sum of its proper divisors (7447905320).

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

5378781640 is a wasteful number, since it uses less digits than its factorization.

5378781640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7762 (or 7758 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

The square root of 5378781640 is about 73340.1775291007. The cubic root of 5378781640 is about 1752.1097428877.

The spelling of 5378781640 in words is "five billion, three hundred seventy-eight million, seven hundred eighty-one thousand, six hundred forty".