30664421 has 4 divisors (see below), whose sum is σ = 30721644. Its totient is φ = 30607200.

The previous prime is 30664411. The next prime is 30664427. The reversal of 30664421 is 12446603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12446603 = 13 ⋅957431.

It can be written as a sum of positive squares in 2 ways, for example, as 13764100 + 16900321 = 3710^2 + 4111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30664421 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 (30664427) 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, 27800 + ... + 28881.

It is an arithmetic number, because the mean of its divisors is an integer number (7680411).

Almost surely, 2^30664421 is an apocalyptic number.

It is an amenable number.

30664421 is a deficient number, since it is larger than the sum of its proper divisors (57223).

30664421 is an equidigital number, since it uses as much as digits as its factorization.

30664421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57222.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 30664421 is about 5537.5464783602. The cubic root of 30664421 is about 313.0004219016. Note that the first 3 decimals are identical.

The spelling of 30664421 in words is "thirty million, six hundred sixty-four thousand, four hundred twenty-one".