30728780 has 12 divisors (see below), whose sum is σ = 64530480. Its totient is φ = 12291504.

The previous prime is 30728771. The next prime is 30728821. The reversal of 30728780 is 8782703.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 30728780.

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, 768200 + ... + 768239.

It is an arithmetic number, because the mean of its divisors is an integer number (5377540).

Almost surely, 2^30728780 is an apocalyptic number.

It is an amenable number.

30728780 is an abundant number, since it is smaller than the sum of its proper divisors (33801700).

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

30728780 is a wasteful number, since it uses less digits than its factorization.

30728780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536448 (or 1536446 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 30728780 is about 5543.3545800354. The cubic root of 30728780 is about 313.2192457239.

The spelling of 30728780 in words is "thirty million, seven hundred twenty-eight thousand, seven hundred eighty".