238428255861 has 128 divisors (see below), whose sum is σ = 384445440000. Its totient is φ = 145670773248.

The previous prime is 238428255859. The next prime is 238428255881. The reversal of 238428255861 is 168552824832.

238428255861 is a `hidden beast` number, since 2 + 3 + 8 + 4 + 2 + 82 + 558 + 6 + 1 = 666.

It is not a de Polignac number, because 238428255861 - 2¹ = 238428255859 is a prime.

Its product of digits (7372800) is a multiple of the sum of its prime factors (960).

It is a junction number, because it is equal to n+sod(n) for n = 238428255798 and 238428255807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238428255881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 386431225 + ... + 386431841.

It is an arithmetic number, because the mean of its divisors is an integer number (3003480000).

Almost surely, 2^238428255861 is an apocalyptic number.

It is an amenable number.

238428255861 is a deficient number, since it is larger than the sum of its proper divisors (146017184139).

238428255861 is a wasteful number, since it uses less digits than its factorization.

238428255861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960 (or 954 counting only the distinct ones).

The product of its digits is 7372800, while the sum is 54.

The spelling of 238428255861 in words is "two hundred thirty-eight billion, four hundred twenty-eight million, two hundred fifty-five thousand, eight hundred sixty-one".