30728856 has 32 divisors (see below), whose sum is σ = 77045760. Its totient is φ = 10213152.

The previous prime is 30728849. The next prime is 30728857. The reversal of 30728856 is 65882703.

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, 7521 + ... + 10863.

It is an arithmetic number, because the mean of its divisors is an integer number (2407680).

Almost surely, 2^30728856 is an apocalyptic number.

It is an amenable number.

30728856 is an abundant number, since it is smaller than the sum of its proper divisors (46316904).

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

30728856 is a wasteful number, since it uses less digits than its factorization.

30728856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3735 (or 3731 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 30728856 is about 5543.3614350861. The cubic root of 30728856 is about 313.2195039470.

The spelling of 30728856 in words is "thirty million, seven hundred twenty-eight thousand, eight hundred fifty-six".