238778550 has 96 divisors (see below), whose sum is σ = 666207360. Its totient is φ = 62877600.

The previous prime is 238778513. The next prime is 238778557. The reversal of 238778550 is 55877832.

238778550 is a `hidden beast` number, since 23 + 8 + 7 + 78 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 238778496 and 238778505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238778557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110985 + ... + 113115.

It is an arithmetic number, because the mean of its divisors is an integer number (6939660).

Almost surely, 2^238778550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 238778550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333103680).

238778550 is an abundant number, since it is smaller than the sum of its proper divisors (427428810).

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

238778550 is a wasteful number, since it uses less digits than its factorization.

238778550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235 (or 2224 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The square root of 238778550 is about 15452.4609690496. The cubic root of 238778550 is about 620.3904495161.

The spelling of 238778550 in words is "two hundred thirty-eight million, seven hundred seventy-eight thousand, five hundred fifty".