30664720 has 40 divisors (see below), whose sum is σ = 73042200. Its totient is φ = 11965440.

The previous prime is 30664709. The next prime is 30664741. The reversal of 30664720 is 2746603.

It can be written as a sum of positive squares in 4 ways, for example, as 1806336 + 28858384 = 1344^2 + 5372^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1395 + ... + 7954.

It is an arithmetic number, because the mean of its divisors is an integer number (1826055).

Almost surely, 2^30664720 is an apocalyptic number.

It is an amenable number.

30664720 is an abundant number, since it is smaller than the sum of its proper divisors (42377480).

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

30664720 is a wasteful number, since it uses less digits than its factorization.

30664720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9403 (or 9397 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 30664720 is about 5537.5734758105. The cubic root of 30664720 is about 313.0014392242.

The spelling of 30664720 in words is "thirty million, six hundred sixty-four thousand, seven hundred twenty".