256537087 has 4 divisors (see below), whose sum is σ = 256620240. Its totient is φ = 256453936.

The previous prime is 256537081. The next prime is 256537109. The reversal of 256537087 is 780735652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256537087 is a prime.

It is a super-2 number, since 2×256537087² = 131622554012891138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256537081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36763 + ... + 43180.

It is an arithmetic number, because the mean of its divisors is an integer number (64155060).

Almost surely, 2^256537087 is an apocalyptic number.

256537087 is a deficient number, since it is larger than the sum of its proper divisors (83153).

256537087 is an equidigital number, since it uses as much as digits as its factorization.

256537087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83152.

The product of its (nonzero) digits is 352800, while the sum is 43.

The square root of 256537087 is about 16016.7751747972. The cubic root of 256537087 is about 635.4041587725.

The spelling of 256537087 in words is "two hundred fifty-six million, five hundred thirty-seven thousand, eighty-seven".