30786428 has 12 divisors (see below), whose sum is σ = 54893160. Its totient is φ = 15102672.

The previous prime is 30786401. The next prime is 30786461. The reversal of 30786428 is 82468703.

It is a junction number, because it is equal to n+sod(n) for n = 30786391 and 30786400.

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, 72398 + ... + 72821.

It is an arithmetic number, because the mean of its divisors is an integer number (4574430).

Almost surely, 2^30786428 is an apocalyptic number.

It is an amenable number.

30786428 is a deficient number, since it is larger than the sum of its proper divisors (24106732).

30786428 is a wasteful number, since it uses less digits than its factorization.

30786428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145276 (or 145274 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 30786428 is about 5548.5518831493. The cubic root of 30786428 is about 313.4149925489.

The spelling of 30786428 in words is "thirty million, seven hundred eighty-six thousand, four hundred twenty-eight".