256780455 has 8 divisors (see below), whose sum is σ = 410848752. Its totient is φ = 136949568.

The previous prime is 256780453. The next prime is 256780457. The reversal of 256780455 is 554087652.

It is an interprime number because it is at equal distance from previous prime (256780453) and next prime (256780457).

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

It is not a de Polignac number, because 256780455 - 2¹ = 256780453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256780453) 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, 8559334 + ... + 8559363.

It is an arithmetic number, because the mean of its divisors is an integer number (51356094).

Almost surely, 2^256780455 is an apocalyptic number.

256780455 is a deficient number, since it is larger than the sum of its proper divisors (154068297).

256780455 is a wasteful number, since it uses less digits than its factorization.

256780455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17118705.

The product of its (nonzero) digits is 336000, while the sum is 42.

The square root of 256780455 is about 16024.3706584689. The cubic root of 256780455 is about 635.6050240317.

The spelling of 256780455 in words is "two hundred fifty-six million, seven hundred eighty thousand, four hundred fifty-five".