30913428 has 48 divisors (see below), whose sum is σ = 88780160. Its totient is φ = 8152704.

The previous prime is 30913427. The next prime is 30913453. The reversal of 30913428 is 82431903.

It is a super-2 number, since 2×30913428² = 1911280061422368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30913395 and 30913404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30913427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13063 + ... + 15246.

Almost surely, 2^30913428 is an apocalyptic number.

It is an amenable number.

30913428 is an abundant number, since it is smaller than the sum of its proper divisors (57866732).

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

30913428 is a wasteful number, since it uses less digits than its factorization.

30913428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28336 (or 28334 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 30913428 is about 5559.9845323526. The cubic root of 30913428 is about 313.8453672200.

The spelling of 30913428 in words is "thirty million, nine hundred thirteen thousand, four hundred twenty-eight".