30728855 has 8 divisors (see below), whose sum is σ = 36908352. Its totient is φ = 24560608.

The previous prime is 30728849. The next prime is 30728857. The reversal of 30728855 is 55882703.

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

It is a cyclic number.

It is not a de Polignac number, because 30728855 - 2¹⁰ = 30727831 is a prime.

It is a super-2 number, since 2×30728855² = 1888525059222050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30728857) 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, 5369 + ... + 9501.

It is an arithmetic number, because the mean of its divisors is an integer number (4613544).

Almost surely, 2^30728855 is an apocalyptic number.

30728855 is a deficient number, since it is larger than the sum of its proper divisors (6179497).

30728855 is a wasteful number, since it uses less digits than its factorization.

30728855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5625.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 30728855 is about 5543.3613448881. The cubic root of 30728855 is about 313.2195005493.

The spelling of 30728855 in words is "thirty million, seven hundred twenty-eight thousand, eight hundred fifty-five".