1678391240 has 32 divisors (see below), whose sum is σ = 3906603000. Its totient is φ = 648205824.

The previous prime is 1678391237. The next prime is 1678391311. The reversal of 1678391240 is 421938761.

It can be written as a sum of positive squares in 4 ways, for example, as 1651121956 + 27269284 = 40634^2 + 5222^2 .

It is an unprimeable number.

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, 722285 + ... + 724604.

Almost surely, 2^1678391240 is an apocalyptic number.

1678391240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1678391240 is an abundant number, since it is smaller than the sum of its proper divisors (2228211760).

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

1678391240 is a wasteful number, since it uses less digits than its factorization.

1678391240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446929 (or 1446925 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1678391240 is about 40968.1735009019. The cubic root of 1678391240 is about 1188.4048112752.

The spelling of 1678391240 in words is "one billion, six hundred seventy-eight million, three hundred ninety-one thousand, two hundred forty".