1678138481 has 8 divisors (see below), whose sum is σ = 1705635840. Its totient is φ = 1650713328.

The previous prime is 1678138471. The next prime is 1678138499. The reversal of 1678138481 is 1848318761.

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 1678138481 - 2¹⁴ = 1678122097 is a prime.

It is a super-2 number, since 2×1678138481² = 5632297522825974722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1678138421) 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 7 ways as a sum of consecutive naturals, for example, 29840 + ... + 65166.

It is an arithmetic number, because the mean of its divisors is an integer number (213204480).

Almost surely, 2^1678138481 is an apocalyptic number.

It is an amenable number.

1678138481 is a deficient number, since it is larger than the sum of its proper divisors (27497359).

1678138481 is an equidigital number, since it uses as much as digits as its factorization.

1678138481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36103.

The product of its digits is 258048, while the sum is 47.

The square root of 1678138481 is about 40965.0885633121. The cubic root of 1678138481 is about 1188.3451519450.

The spelling of 1678138481 in words is "one billion, six hundred seventy-eight million, one hundred thirty-eight thousand, four hundred eighty-one".