19776428 has 12 divisors (see below), whose sum is σ = 39552912. Its totient is φ = 8475600.

The previous prime is 19776413. The next prime is 19776433. The reversal of 19776428 is 82467791.

19776428 is an admirable number.

It is a super-2 number, since 2×19776428² = 782214208878368, which contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 353123 + ... + 353178.

It is an arithmetic number, because the mean of its divisors is an integer number (3296076).

Almost surely, 2^19776428 is an apocalyptic number.

It is an amenable number.

19776428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19776428 is a wasteful number, since it uses less digits than its factorization.

19776428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706312 (or 706310 counting only the distinct ones).

The product of its digits is 169344, while the sum is 44.

The square root of 19776428 is about 4447.0695969368. The cubic root of 19776428 is about 270.4265229343.

The spelling of 19776428 in words is "nineteen million, seven hundred seventy-six thousand, four hundred twenty-eight".