1678921734 has 64 divisors (see below), whose sum is σ = 4074195456. Its totient is φ = 450261504.

The previous prime is 1678921663. The next prime is 1678921753. The reversal of 1678921734 is 4371298761.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 280497 + ... + 286419.

It is an arithmetic number, because the mean of its divisors is an integer number (63659304).

Almost surely, 2^1678921734 is an apocalyptic number.

1678921734 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 1678921734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2037097728).

1678921734 is an abundant number, since it is smaller than the sum of its proper divisors (2395273722).

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

1678921734 is a wasteful number, since it uses less digits than its factorization.

1678921734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6349.

The product of its digits is 508032, while the sum is 48.

The square root of 1678921734 is about 40974.6474542491. The cubic root of 1678921734 is about 1188.5300056075.

The spelling of 1678921734 in words is "one billion, six hundred seventy-eight million, nine hundred twenty-one thousand, seven hundred thirty-four".