30428261 has 4 divisors (see below), whose sum is σ = 30439500. Its totient is φ = 30417024.

The previous prime is 30428243. The next prime is 30428269. The reversal of 30428261 is 16282403.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 23951236 + 6477025 = 4894^2 + 2545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30428261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30428261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30428269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1205 + ... + 7893.

It is an arithmetic number, because the mean of its divisors is an integer number (7609875).

Almost surely, 2^30428261 is an apocalyptic number.

It is an amenable number.

30428261 is a deficient number, since it is larger than the sum of its proper divisors (11239).

30428261 is an equidigital number, since it uses as much as digits as its factorization.

30428261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11238.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 30428261 is about 5516.1817410234. The cubic root of 30428261 is about 312.1948329709.

The spelling of 30428261 in words is "thirty million, four hundred twenty-eight thousand, two hundred sixty-one".