256057465 has 8 divisors (see below), whose sum is σ = 308878848. Its totient is φ = 203772720.

The previous prime is 256057441. The next prime is 256057481. The reversal of 256057465 is 564750652.

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

It is not a de Polignac number, because 256057465 - 2¹¹ = 256055417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 133107 + ... + 135016.

It is an arithmetic number, because the mean of its divisors is an integer number (38609856).

Almost surely, 2^256057465 is an apocalyptic number.

It is an amenable number.

256057465 is a deficient number, since it is larger than the sum of its proper divisors (52821383).

256057465 is a wasteful number, since it uses less digits than its factorization.

256057465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268319.

The product of its (nonzero) digits is 252000, while the sum is 40.

The square root of 256057465 is about 16001.7956804854. The cubic root of 256057465 is about 635.0079276502.

It can be divided in two parts, 2560 and 57465, that added together give a square (60025 = 245²).

The spelling of 256057465 in words is "two hundred fifty-six million, fifty-seven thousand, four hundred sixty-five".