1678778934 has 128 divisors (see below), whose sum is σ = 4342947840. Its totient is φ = 421065216.

The previous prime is 1678778909. The next prime is 1678779007. The reversal of 1678778934 is 4398778761.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 907999 + ... + 909845.

It is an arithmetic number, because the mean of its divisors is an integer number (33929280).

Almost surely, 2^1678778934 is an apocalyptic number.

1678778934 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1678778934, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2171473920).

1678778934 is an abundant number, since it is smaller than the sum of its proper divisors (2664168906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1678778934 is a wasteful number, since it uses less digits than its factorization.

1678778934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962.

The product of its digits is 14224896, while the sum is 60.

The square root of 1678778934 is about 40972.9048762716. The cubic root of 1678778934 is about 1188.4963080079.

The spelling of 1678778934 in words is "one billion, six hundred seventy-eight million, seven hundred seventy-eight thousand, nine hundred thirty-four".