30428957 has 6 divisors (see below), whose sum is σ = 32949882. Its totient is φ = 28088112.

The previous prime is 30428947. The next prime is 30428969. The reversal of 30428957 is 75982403.

It can be written as a sum of positive squares in 3 ways, for example, as 1473796 + 28955161 = 1214^2 + 5381^2 .

It is not a de Polignac number, because 30428957 - 2²² = 26234653 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 30428957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30428927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89858 + ... + 90195.

It is an arithmetic number, because the mean of its divisors is an integer number (5491647).

Almost surely, 2^30428957 is an apocalyptic number.

It is an amenable number.

30428957 is a deficient number, since it is larger than the sum of its proper divisors (2520925).

30428957 is a wasteful number, since it uses less digits than its factorization.

30428957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180079 (or 180066 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 30428957 is about 5516.2448277791. The cubic root of 30428957 is about 312.1972132794.

The spelling of 30428957 in words is "thirty million, four hundred twenty-eight thousand, nine hundred fifty-seven".