256632005 has 16 divisors (see below), whose sum is σ = 357920640. Its totient is φ = 172992192.

The previous prime is 256632001. The next prime is 256632071. The reversal of 256632005 is 500236652.

256632005 = 9248² + 9249² + 9250².

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 256632005 - 2² = 256632001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256632001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60074 + ... + 64203.

It is an arithmetic number, because the mean of its divisors is an integer number (22370040).

Almost surely, 2^256632005 is an apocalyptic number.

It is an amenable number.

256632005 is a deficient number, since it is larger than the sum of its proper divisors (101288635).

256632005 is a wasteful number, since it uses less digits than its factorization.

256632005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124348.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 256632005 is about 16019.7379816275. The cubic root of 256632005 is about 635.4825150260.

Adding to 256632005 its reverse (500236652), we get a palindrome (756868657).

The spelling of 256632005 in words is "two hundred fifty-six million, six hundred thirty-two thousand, five".