30128666 has 12 divisors (see below), whose sum is σ = 47245002. Its totient is φ = 14408856.

The previous prime is 30128663. The next prime is 30128669. The reversal of 30128666 is 66682103.

It is an interprime number because it is at equal distance from previous prime (30128663) and next prime (30128669).

It can be written as a sum of positive squares in only one way, i.e., 26306641 + 3822025 = 5129^2 + 1955^2 .

It is not an unprimeable number, because it can be changed into a prime (30128663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13181 + ... + 15296.

Almost surely, 2^30128666 is an apocalyptic number.

30128666 is a deficient number, since it is larger than the sum of its proper divisors (17116336).

30128666 is a wasteful number, since it uses less digits than its factorization.

30128666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28525 (or 28502 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 30128666 is about 5488.9585533141. The cubic root of 30128666 is about 311.1668339060.

The spelling of 30128666 in words is "thirty million, one hundred twenty-eight thousand, six hundred sixty-six".