30664638 has 48 divisors (see below), whose sum is σ = 69962256. Its totient is φ = 9694080.

The previous prime is 30664637. The next prime is 30664657. The reversal of 30664638 is 83646603.

30664638 is a `hidden beast` number, since 3 + 0 + 6 + 646 + 3 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30664637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26745 + ... + 27867.

It is an arithmetic number, because the mean of its divisors is an integer number (1457547).

Almost surely, 2^30664638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30664638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34981128).

30664638 is an abundant number, since it is smaller than the sum of its proper divisors (39297618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30664638 is a wasteful number, since it uses less digits than its factorization.

30664638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209 (or 1206 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 30664638 is about 5537.5660718406. The cubic root of 30664638 is about 313.0011602267.

The spelling of 30664638 in words is "thirty million, six hundred sixty-four thousand, six hundred thirty-eight".