256170387 has 8 divisors (see below), whose sum is σ = 372611520. Its totient is φ = 155254760.

The previous prime is 256170371. The next prime is 256170437. The reversal of 256170387 is 783071652.

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 256170387 - 2⁴ = 256170371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256170347) 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, 3881337 + ... + 3881402.

It is an arithmetic number, because the mean of its divisors is an integer number (46576440).

Almost surely, 2^256170387 is an apocalyptic number.

256170387 is a deficient number, since it is larger than the sum of its proper divisors (116441133).

256170387 is a wasteful number, since it uses less digits than its factorization.

256170387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7762753.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 256170387 is about 16005.3237080666. The cubic root of 256170387 is about 635.1012606408.

The spelling of 256170387 in words is "two hundred fifty-six million, one hundred seventy thousand, three hundred eighty-seven".