678481129 has 8 divisors (see below), whose sum is σ = 707004360. Its totient is φ = 650299776.

The previous prime is 678481109. The next prime is 678481171. The reversal of 678481129 is 921184876.

It can be written as a sum of positive squares in 4 ways, for example, as 115605504 + 562875625 = 10752^2 + 23725^2 .

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 678481129 - 2¹³ = 678472937 is a prime.

It is a super-2 number, since 2×678481129² = 920673284818229282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678481109) 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, 81414 + ... + 89359.

It is an arithmetic number, because the mean of its divisors is an integer number (88375545).

Almost surely, 2^678481129 is an apocalyptic number.

It is an amenable number.

678481129 is a deficient number, since it is larger than the sum of its proper divisors (28523231).

678481129 is a wasteful number, since it uses less digits than its factorization.

678481129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170939.

The product of its digits is 193536, while the sum is 46.

The square root of 678481129 is about 26047.6703180918. The cubic root of 678481129 is about 878.7107191874.

The spelling of 678481129 in words is "six hundred seventy-eight million, four hundred eighty-one thousand, one hundred twenty-nine".