256780003 has 8 divisors (see below), whose sum is σ = 270859520. Its totient is φ = 242757000.

The previous prime is 256780001. The next prime is 256780021. The reversal of 256780003 is 300087652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256780003 - 2¹ = 256780001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256780001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4623 + ... + 23128.

It is an arithmetic number, because the mean of its divisors is an integer number (33857440).

Almost surely, 2^256780003 is an apocalyptic number.

256780003 is a deficient number, since it is larger than the sum of its proper divisors (14079517).

256780003 is a wasteful number, since it uses less digits than its factorization.

256780003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28257.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 256780003 is about 16024.3565549447. The cubic root of 256780003 is about 635.6046510884.

The spelling of 256780003 in words is "two hundred fifty-six million, seven hundred eighty thousand, three".