1678855020 has 144 divisors (see below), whose sum is σ = 4954813920. Its totient is φ = 424424448.

The previous prime is 1678855019. The next prime is 1678855021. The reversal of 1678855020 is 205588761.

It is an interprime number because it is at equal distance from previous prime (1678855019) and next prime (1678855021).

It is not an unprimeable number, because it can be changed into a prime (1678855021) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 4104576 + ... + 4104984.

It is an arithmetic number, because the mean of its divisors is an integer number (34408430).

Almost surely, 2^1678855020 is an apocalyptic number.

1678855020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1678855020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2477406960).

1678855020 is an abundant number, since it is smaller than the sum of its proper divisors (3275958900).

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

1678855020 is a wasteful number, since it uses less digits than its factorization.

1678855020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 499 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 1678855020 is about 40973.8333574002. The cubic root of 1678855020 is about 1188.5142628365.

The spelling of 1678855020 in words is "one billion, six hundred seventy-eight million, eight hundred fifty-five thousand, twenty".