256171732 has 12 divisors (see below), whose sum is σ = 463759380. Its totient is φ = 123669056.

The previous prime is 256171717. The next prime is 256171739. The reversal of 256171732 is 237171652.

It can be written as a sum of positive squares in 2 ways, for example, as 99321156 + 156850576 = 9966^2 + 12524^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256171739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1104073 + ... + 1104304.

It is an arithmetic number, because the mean of its divisors is an integer number (38646615).

Almost surely, 2^256171732 is an apocalyptic number.

It is an amenable number.

256171732 is a deficient number, since it is larger than the sum of its proper divisors (207587648).

256171732 is a wasteful number, since it uses less digits than its factorization.

256171732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208410 (or 2208408 counting only the distinct ones).

The product of its digits is 17640, while the sum is 34.

The square root of 256171732 is about 16005.3657252810. The cubic root of 256171732 is about 635.1023721532.

The spelling of 256171732 in words is "two hundred fifty-six million, one hundred seventy-one thousand, seven hundred thirty-two".