30428729 has 2 divisors, whose sum is σ = 30428730. Its totient is φ = 30428728.

The previous prime is 30428687. The next prime is 30428737. The reversal of 30428729 is 92782403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 9314704 = 4595^2 + 3052^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30428729 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30428789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15214364 + 15214365.

It is an arithmetic number, because the mean of its divisors is an integer number (15214365).

Almost surely, 2^30428729 is an apocalyptic number.

It is an amenable number.

30428729 is a deficient number, since it is larger than the sum of its proper divisors (1).

30428729 is an equidigital number, since it uses as much as digits as its factorization.

30428729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 30428729 is about 5516.2241615076. The cubic root of 30428729 is about 312.1964335272.

The spelling of 30428729 in words is "thirty million, four hundred twenty-eight thousand, seven hundred twenty-nine".