256066500 has 48 divisors (see below), whose sum is σ = 745670016. Its totient is φ = 68284000.

The previous prime is 256066463. The next prime is 256066507. The reversal of 256066500 is 5660652.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (256066507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83856 + ... + 86855.

It is an arithmetic number, because the mean of its divisors is an integer number (15534792).

Almost surely, 2^256066500 is an apocalyptic number.

256066500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256066500 is an abundant number, since it is smaller than the sum of its proper divisors (489603516).

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

256066500 is a wasteful number, since it uses less digits than its factorization.

256066500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170733 (or 170721 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 256066500 is about 16002.0779900612. The cubic root of 256066500 is about 635.0153963242.

The spelling of 256066500 in words is "two hundred fifty-six million, sixty-six thousand, five hundred".