19663428 has 48 divisors (see below), whose sum is σ = 47897024. Its totient is φ = 6272640.

The previous prime is 19663417. The next prime is 19663463. The reversal of 19663428 is 82436691.

It is a super-2 number, since 2×19663428² = 773300801422368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29418 + ... + 30078.

Almost surely, 2^19663428 is an apocalyptic number.

It is an amenable number.

19663428 is an abundant number, since it is smaller than the sum of its proper divisors (28233596).

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

19663428 is a wasteful number, since it uses less digits than its factorization.

19663428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 770 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 19663428 is about 4434.3464005420. The cubic root of 19663428 is about 269.9104778656.

The spelling of 19663428 in words is "nineteen million, six hundred sixty-three thousand, four hundred twenty-eight".