30728860 has 24 divisors (see below), whose sum is σ = 68327280. Its totient is φ = 11568384.

The previous prime is 30728857. The next prime is 30728861. The reversal of 30728860 is 6882703.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30728861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44850 + ... + 45529.

It is an arithmetic number, because the mean of its divisors is an integer number (2846970).

Almost surely, 2^30728860 is an apocalyptic number.

It is an amenable number.

30728860 is an abundant number, since it is smaller than the sum of its proper divisors (37598420).

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

30728860 is a wasteful number, since it uses less digits than its factorization.

30728860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90405 (or 90403 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 30728860 is about 5543.3617958780. The cubic root of 30728860 is about 313.2195175376.

The spelling of 30728860 in words is "thirty million, seven hundred twenty-eight thousand, eight hundred sixty".