1678426677 has 20 divisors (see below), whose sum is σ = 2654768556. Its totient is φ = 1053129600.

The previous prime is 1678426663. The next prime is 1678426699. The reversal of 1678426677 is 7766248761.

It can be written as a sum of positive squares in 2 ways, for example, as 1007046756 + 671379921 = 31734^2 + 25911^2 .

It is not a de Polignac number, because 1678426677 - 2¹⁹ = 1677902389 is a prime.

It is a super-2 number, since 2×1678426677² = 5634232220130524658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678426777) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 608074 + ... + 610827.

Almost surely, 2^1678426677 is an apocalyptic number.

1678426677 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1678426677 is a deficient number, since it is larger than the sum of its proper divisors (976341879).

1678426677 is a wasteful number, since it uses less digits than its factorization.

1678426677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218930 (or 1218921 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 54.

The square root of 1678426677 is about 40968.6059928819. The cubic root of 1678426677 is about 1188.4131750790.

The spelling of 1678426677 in words is "one billion, six hundred seventy-eight million, four hundred twenty-six thousand, six hundred seventy-seven".