256117950 has 120 divisors (see below), whose sum is σ = 776457000. Its totient is φ = 62078400.

The previous prime is 256117943. The next prime is 256117987. The reversal of 256117950 is 59711652.

256117950 is a `hidden beast` number, since 2 + 561 + 1 + 7 + 95 + 0 = 666.

256117950 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 41676 + ... + 47424.

It is an arithmetic number, because the mean of its divisors is an integer number (6470475).

Almost surely, 2^256117950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256117950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388228500).

256117950 is an abundant number, since it is smaller than the sum of its proper divisors (520339050).

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

256117950 is a wasteful number, since it uses less digits than its factorization.

256117950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5784 (or 5770 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The square root of 256117950 is about 16003.6855130311. The cubic root of 256117950 is about 635.0579234987.

The spelling of 256117950 in words is "two hundred fifty-six million, one hundred seventeen thousand, nine hundred fifty".