1678020 has 24 divisors (see below), whose sum is σ = 4698624. Its totient is φ = 447456.

The previous prime is 1678013. The next prime is 1678021. The reversal of 1678020 is 208761.

It is a super-2 number, since 2×1678020² = 5631502240800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1678021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13924 + ... + 14043.

It is an arithmetic number, because the mean of its divisors is an integer number (195776).

2^1678020 is an apocalyptic number.

1678020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1678020 is an abundant number, since it is smaller than the sum of its proper divisors (3020604).

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

1678020 is a wasteful number, since it uses less digits than its factorization.

1678020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27979 (or 27977 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 1678020 is about 1295.3841129179. The cubic root of 1678020 is about 118.8317184520.

The spelling of 1678020 in words is "one million, six hundred seventy-eight thousand, twenty".