256172500 has 60 divisors (see below), whose sum is σ = 573466432. Its totient is φ = 100044000.

The previous prime is 256172471. The next prime is 256172519. The reversal of 256172500 is 5271652.

256172500 is digitally balanced in base 2, because in such base 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 19 ways as a sum of consecutive naturals, for example, 106309 + ... + 108691.

Almost surely, 2^256172500 is an apocalyptic number.

256172500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256172500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286733216).

256172500 is an abundant number, since it is smaller than the sum of its proper divisors (317293932).

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

256172500 is a wasteful number, since it uses less digits than its factorization.

256172500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450 (or 2433 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 256172500 is about 16005.3897172171. The cubic root of 256172500 is about 635.1030068292.

The spelling of 256172500 in words is "two hundred fifty-six million, one hundred seventy-two thousand, five hundred".