30947928 has 48 divisors (see below), whose sum is σ = 85050840. Its totient is φ = 9377280.

The previous prime is 30947927. The next prime is 30947953. The reversal of 30947928 is 82974903.

It is a self number, because there is not a number n which added to its sum of digits gives 30947928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30947927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2425 + ... + 8232.

Almost surely, 2^30947928 is an apocalyptic number.

It is an amenable number.

30947928 is an abundant number, since it is smaller than the sum of its proper divisors (54102912).

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

30947928 is a wasteful number, since it uses less digits than its factorization.

30947928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10688 (or 10673 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 30947928 is about 5563.0861938316. The cubic root of 30947928 is about 313.9620763698.

The spelling of 30947928 in words is "thirty million, nine hundred forty-seven thousand, nine hundred twenty-eight".