30728684 has 24 divisors (see below), whose sum is σ = 62714400. Its totient is φ = 13168848.

The previous prime is 30728669. The next prime is 30728699. The reversal of 30728684 is 48682703.

It is an interprime number because it is at equal distance from previous prime (30728669) and next prime (30728699).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9827 + ... + 12570.

It is an arithmetic number, because the mean of its divisors is an integer number (2613100).

Almost surely, 2^30728684 is an apocalyptic number.

It is an amenable number.

30728684 is an abundant number, since it is smaller than the sum of its proper divisors (31985716).

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

30728684 is a wasteful number, since it uses less digits than its factorization.

30728684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22422 (or 22406 counting only the distinct ones).

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

The square root of 30728684 is about 5543.3459210120. The cubic root of 30728684 is about 313.2189195467.

The spelling of 30728684 in words is "thirty million, seven hundred twenty-eight thousand, six hundred eighty-four".