1678428667 has 2 divisors, whose sum is σ = 1678428668. Its totient is φ = 1678428666.

The previous prime is 1678428659. The next prime is 1678428671. The reversal of 1678428667 is 7668248761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1678428667 - 2³ = 1678428659 is a prime.

It is not a weakly prime, because it can be changed into another prime (1678428607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839214333 + 839214334.

It is an arithmetic number, because the mean of its divisors is an integer number (839214334).

Almost surely, 2^1678428667 is an apocalyptic number.

1678428667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678428667 is an equidigital number, since it uses as much as digits as its factorization.

1678428667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5419008, while the sum is 55.

The square root of 1678428667 is about 40968.6302797641. The cubic root of 1678428667 is about 1188.4136447532.

It can be divided in two parts, 16784 and 28667, that added together give a triangular number (45451 = T₃₀₁).

The spelling of 1678428667 in words is "one billion, six hundred seventy-eight million, four hundred twenty-eight thousand, six hundred sixty-seven".