170256978 has 48 divisors (see below), whose sum is σ = 388891776. Its totient is φ = 55812240.

The previous prime is 170256959. The next prime is 170256979. The reversal of 170256978 is 879652071.

170256978 is a `hidden beast` number, since 17 + 0 + 2 + 569 + 78 = 666.

It is not an unprimeable number, because it can be changed into a prime (170256979) 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, 26775 + ... + 32517.

It is an arithmetic number, because the mean of its divisors is an integer number (8101912).

Almost surely, 2^170256978 is an apocalyptic number.

170256978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 170256978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194445888).

170256978 is an abundant number, since it is smaller than the sum of its proper divisors (218634798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

170256978 is an equidigital number, since it uses as much as digits as its factorization.

170256978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5821 (or 5809 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 170256978 is about 13048.2557455010. The cubic root of 170256978 is about 554.2448165764.

The spelling of 170256978 in words is "one hundred seventy million, two hundred fifty-six thousand, nine hundred seventy-eight".