30128864 has 24 divisors (see below), whose sum is σ = 59446800. Its totient is φ = 15031296.

The previous prime is 30128863. The next prime is 30128867. The reversal of 30128864 is 46882103.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 30128864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30128863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20837 + ... + 22235.

It is an arithmetic number, because the mean of its divisors is an integer number (2476950).

Almost surely, 2^30128864 is an apocalyptic number.

It is an amenable number.

30128864 is a deficient number, since it is larger than the sum of its proper divisors (29317936).

30128864 is a wasteful number, since it uses less digits than its factorization.

30128864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082 (or 2074 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 30128864 is about 5488.9765894928. The cubic root of 30128864 is about 311.1675155480.

The spelling of 30128864 in words is "thirty million, one hundred twenty-eight thousand, eight hundred sixty-four".