3128428 has 6 divisors (see below), whose sum is σ = 5474756. Its totient is φ = 1564212.

The previous prime is 3128401. The next prime is 3128443. The reversal of 3128428 is 8248213.

It is a junction number, because it is equal to n+sod(n) for n = 3128396 and 3128405.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391050 + ... + 391057.

Almost surely, 2^3128428 is an apocalyptic number.

It is an amenable number.

3128428 is a deficient number, since it is larger than the sum of its proper divisors (2346328).

3128428 is a wasteful number, since it uses less digits than its factorization.

3128428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782111 (or 782109 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 3128428 is about 1768.7362720315. The cubic root of 3128428 is about 146.2543262168.

The spelling of 3128428 in words is "three million, one hundred twenty-eight thousand, four hundred twenty-eight".