30272821 has 4 divisors (see below), whose sum is σ = 30301612. Its totient is φ = 30244032.

The previous prime is 30272819. The next prime is 30272843. The reversal of 30272821 is 12827203.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14976900 + 15295921 = 3870^2 + 3911^2 .

It is a cyclic number.

It is not a de Polignac number, because 30272821 - 2¹ = 30272819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30275821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12756 + ... + 14941.

It is an arithmetic number, because the mean of its divisors is an integer number (7575403).

Almost surely, 2^30272821 is an apocalyptic number.

It is an amenable number.

30272821 is a deficient number, since it is larger than the sum of its proper divisors (28791).

30272821 is a wasteful number, since it uses less digits than its factorization.

30272821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28790.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 30272821 is about 5502.0742452279. The cubic root of 30272821 is about 311.6623188822.

The spelling of 30272821 in words is "thirty million, two hundred seventy-two thousand, eight hundred twenty-one".