30018728 has 16 divisors (see below), whose sum is σ = 57240000. Its totient is φ = 14754736.

The previous prime is 30018679. The next prime is 30018731. The reversal of 30018728 is 82781003.

It is a super-2 number, since 2×30018728² = 1802248061475968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30018728.

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, 31328 + ... + 32271.

It is an arithmetic number, because the mean of its divisors is an integer number (3577500).

Almost surely, 2^30018728 is an apocalyptic number.

It is an amenable number.

30018728 is a deficient number, since it is larger than the sum of its proper divisors (27221272).

30018728 is a wasteful number, since it uses less digits than its factorization.

30018728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63664 (or 63660 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 30018728 is about 5478.9349329956. The cubic root of 30018728 is about 310.7878952014.

The spelling of 30018728 in words is "thirty million, eighteen thousand, seven hundred twenty-eight".