256402487 has 8 divisors (see below), whose sum is σ = 281755152. Its totient is φ = 231390400.

The previous prime is 256402481. The next prime is 256402529. The reversal of 256402487 is 784204652.

256402487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 256402487 - 2¹² = 256398391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256402487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256402481) 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, 83564 + ... + 86577.

It is an arithmetic number, because the mean of its divisors is an integer number (35219394).

Almost surely, 2^256402487 is an apocalyptic number.

256402487 is a deficient number, since it is larger than the sum of its proper divisors (25352665).

256402487 is a wasteful number, since it uses less digits than its factorization.

256402487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170289.

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 256402487 is about 16012.5727789134. The cubic root of 256402487 is about 635.2930112798.

The spelling of 256402487 in words is "two hundred fifty-six million, four hundred two thousand, four hundred eighty-seven".