1678428 has 24 divisors (see below), whose sum is σ = 4351760. Its totient is φ = 559440.

The previous prime is 1678423. The next prime is 1678429. The reversal of 1678428 is 8248761.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1678392 and 1678401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7663 + ... + 7878.

2^1678428 is an apocalyptic number.

1678428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1678428 is an abundant number, since it is smaller than the sum of its proper divisors (2673332).

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

1678428 is a wasteful number, since it uses less digits than its factorization.

1678428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15554 (or 15546 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 1678428 is about 1295.5415855927. The cubic root of 1678428 is about 118.8413487330.

The spelling of 1678428 in words is "one million, six hundred seventy-eight thousand, four hundred twenty-eight".