256420116 has 18 divisors (see below), whose sum is σ = 648173162. Its totient is φ = 85473360.

The previous prime is 256420091. The next prime is 256420139. The reversal of 256420116 is 611024652.

256420116 is a `hidden beast` number, since 2 + 5 + 642 + 0 + 1 + 16 = 666.

It can be written as a sum of positive squares in only one way, i.e., 156500100 + 99920016 = 12510^2 + 9996^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 256420116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3561355 + ... + 3561426.

Almost surely, 2^256420116 is an apocalyptic number.

It is an amenable number.

256420116 is an abundant number, since it is smaller than the sum of its proper divisors (391753046).

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

256420116 is a wasteful number, since it uses less digits than its factorization.

256420116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7122791 (or 7122786 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 256420116 is about 16013.1232431403. The cubic root of 256420116 is about 635.3075708420.

Adding to 256420116 its reverse (611024652), we get a palindrome (867444768).

The spelling of 256420116 in words is "two hundred fifty-six million, four hundred twenty thousand, one hundred sixteen".