55378280640 has 224 divisors, whose sum is σ = 187822514880. Its totient is φ = 13775405056.

The previous prime is 55378280599. The next prime is 55378280647. The reversal of 55378280640 is 4608287355.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 55378280640.

It is not an unprimeable number, because it can be changed into a prime (55378280647) 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, 1829146 + ... + 1859174.

It is an arithmetic number, because the mean of its divisors is an integer number (838493370).

Almost surely, 2^55378280640 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 55378280640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93911257440).

55378280640 is an abundant number, since it is smaller than the sum of its proper divisors (132444234240).

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

55378280640 is a wasteful number, since it uses less digits than its factorization.

55378280640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30179 (or 30169 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 55378280640 in words is "fifty-five billion, three hundred seventy-eight million, two hundred eighty thousand, six hundred forty".