256404365 has 32 divisors (see below), whose sum is σ = 362444544. Its totient is φ = 170472960.

The previous prime is 256404361. The next prime is 256404409. The reversal of 256404365 is 563404652.

It is a happy number.

It is not a de Polignac number, because 256404365 - 2² = 256404361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256404361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 282242 + ... + 283148.

It is an arithmetic number, because the mean of its divisors is an integer number (11326392).

Almost surely, 2^256404365 is an apocalyptic number.

It is an amenable number.

256404365 is a deficient number, since it is larger than the sum of its proper divisors (106040179).

256404365 is a wasteful number, since it uses less digits than its factorization.

256404365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 256404365 is about 16012.6314202257. The cubic root of 256404365 is about 635.2945623274.

The spelling of 256404365 in words is "two hundred fifty-six million, four hundred four thousand, three hundred sixty-five".