30309428 has 12 divisors (see below), whose sum is σ = 54042660. Its totient is φ = 14868672.

The previous prime is 30309371. The next prime is 30309449. The reversal of 30309428 is 82490303.

It can be written as a sum of positive squares in 2 ways, for example, as 9314704 + 20994724 = 3052^2 + 4582^2 .

It is a super-2 number, since 2×30309428² = 1837322851374368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30309428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71273 + ... + 71696.

It is an arithmetic number, because the mean of its divisors is an integer number (4503555).

Almost surely, 2^30309428 is an apocalyptic number.

It is an amenable number.

30309428 is a deficient number, since it is larger than the sum of its proper divisors (23733232).

30309428 is a wasteful number, since it uses less digits than its factorization.

30309428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143026 (or 143024 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 30309428 is about 5505.3998946489. The cubic root of 30309428 is about 311.7878927631.

The spelling of 30309428 in words is "thirty million, three hundred nine thousand, four hundred twenty-eight".