1678988520 has 512 divisors, whose sum is σ = 6502809600. Its totient is φ = 381542400.

The previous prime is 1678988503. The next prime is 1678988533. The reversal of 1678988520 is 258898761.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 127 ways as a sum of consecutive naturals, for example, 17309112 + ... + 17309208.

It is an arithmetic number, because the mean of its divisors is an integer number (12700800).

Almost surely, 2^1678988520 is an apocalyptic number.

1678988520 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 1678988520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3251404800).

1678988520 is an abundant number, since it is smaller than the sum of its proper divisors (4823821080).

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

1678988520 is a wasteful number, since it uses less digits than its factorization.

1678988520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The square root of 1678988520 is about 40975.4624134982. The cubic root of 1678988520 is about 1188.5457649509.

The spelling of 1678988520 in words is "one billion, six hundred seventy-eight million, nine hundred eighty-eight thousand, five hundred twenty".