30528421 has 36 divisors (see below), whose sum is σ = 41240640. Its totient is φ = 22453200.

The previous prime is 30528373. The next prime is 30528437. The reversal of 30528421 is 12482503.

It is not a de Polignac number, because 30528421 - 2¹³ = 30520229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30528721) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 112516 + ... + 112786.

Almost surely, 2^30528421 is an apocalyptic number.

It is an amenable number.

30528421 is a deficient number, since it is larger than the sum of its proper divisors (10712219).

30528421 is a wasteful number, since it uses less digits than its factorization.

30528421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 30528421 is about 5525.2530258804. The cubic root of 30528421 is about 312.5370059643.

The spelling of 30528421 in words is "thirty million, five hundred twenty-eight thousand, four hundred twenty-one".