30828381 has 8 divisors (see below), whose sum is σ = 41979264. Its totient is φ = 20114880.

The previous prime is 30828359. The next prime is 30828397. The reversal of 30828381 is 18382803.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30828381 - 2⁷ = 30828253 is a prime.

It is a super-2 number, since 2×30828381² = 1900778150162322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30828341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109180 + ... + 109461.

It is an arithmetic number, because the mean of its divisors is an integer number (5247408).

Almost surely, 2^30828381 is an apocalyptic number.

It is an amenable number.

30828381 is a deficient number, since it is larger than the sum of its proper divisors (11150883).

30828381 is a wasteful number, since it uses less digits than its factorization.

30828381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218691.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 30828381 is about 5552.3311320562. The cubic root of 30828381 is about 313.5572926026.

The spelling of 30828381 in words is "thirty million, eight hundred twenty-eight thousand, three hundred eighty-one".