256454761 has 24 divisors (see below), whose sum is σ = 287267904. Its totient is φ = 228428640.

The previous prime is 256454749. The next prime is 256454771. The reversal of 256454761 is 167454652.

It is a happy number.

It is not a de Polignac number, because 256454761 - 2¹³ = 256446569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256454771) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 556071 + ... + 556531.

It is an arithmetic number, because the mean of its divisors is an integer number (11969496).

Almost surely, 2^256454761 is an apocalyptic number.

It is an amenable number.

256454761 is a deficient number, since it is larger than the sum of its proper divisors (30813143).

256454761 is a wasteful number, since it uses less digits than its factorization.

256454761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589 (or 570 counting only the distinct ones).

The product of its digits is 201600, while the sum is 40.

The square root of 256454761 is about 16014.2049755834. The cubic root of 256454761 is about 635.3361817533.

The spelling of 256454761 in words is "two hundred fifty-six million, four hundred fifty-four thousand, seven hundred sixty-one".