30664021 has 4 divisors (see below), whose sum is σ = 30689100. Its totient is φ = 30638944.

The previous prime is 30664003. The next prime is 30664063. The reversal of 30664021 is 12046603.

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 15100996 + 15563025 = 3886^2 + 3945^2 .

It is a cyclic number.

It is not a de Polignac number, because 30664021 - 2²³ = 22275413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30663983 and 30664001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30664001) 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, 10606 + ... + 13183.

It is an arithmetic number, because the mean of its divisors is an integer number (7672275).

Almost surely, 2^30664021 is an apocalyptic number.

It is an amenable number.

30664021 is a deficient number, since it is larger than the sum of its proper divisors (25079).

30664021 is a wasteful number, since it uses less digits than its factorization.

30664021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25078.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 30664021 is about 5537.5103611641. The cubic root of 30664021 is about 312.9990609246. Note that the first 3 decimals are identical.

The spelling of 30664021 in words is "thirty million, six hundred sixty-four thousand, twenty-one".