1781478428 has 12 divisors (see below), whose sum is σ = 3124627800. Its totient is φ = 888727632.

The previous prime is 1781478397. The next prime is 1781478449. The reversal of 1781478428 is 8248741871.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500903 + ... + 504446.

It is an arithmetic number, because the mean of its divisors is an integer number (260385650).

Almost surely, 2^1781478428 is an apocalyptic number.

It is an amenable number.

1781478428 is a deficient number, since it is larger than the sum of its proper divisors (1343149372).

1781478428 is a wasteful number, since it uses less digits than its factorization.

1781478428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005796 (or 1005794 counting only the distinct ones).

The product of its digits is 802816, while the sum is 50.

The square root of 1781478428 is about 42207.5636349695. The cubic root of 1781478428 is about 1212.2537119489.

The spelling of 1781478428 in words is "one billion, seven hundred eighty-one million, four hundred seventy-eight thousand, four hundred twenty-eight".