1678424917 has 8 divisors (see below), whose sum is σ = 1810093880. Its totient is φ = 1547121600.

The previous prime is 1678424903. The next prime is 1678424927. The reversal of 1678424917 is 7194248761.

It can be written as a sum of positive squares in 4 ways, for example, as 171898321 + 1506526596 = 13111^2 + 38814^2 .

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 1678424917 - 2⁷ = 1678424789 is a prime.

It is a super-2 number, since 2×1678424917² = 5634220404012913778, 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 (1678424927) 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, 81834 + ... + 100267.

It is an arithmetic number, because the mean of its divisors is an integer number (226261735).

Almost surely, 2^1678424917 is an apocalyptic number.

It is an amenable number.

1678424917 is a deficient number, since it is larger than the sum of its proper divisors (131668963).

1678424917 is a wasteful number, since it uses less digits than its factorization.

1678424917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182823.

The product of its digits is 677376, while the sum is 49.

The square root of 1678424917 is about 40968.5845130144. The cubic root of 1678424917 is about 1188.4127596884.

The spelling of 1678424917 in words is "one billion, six hundred seventy-eight million, four hundred twenty-four thousand, nine hundred seventeen".