30640000 has 80 divisors (see below), whose sum is σ = 76475520. Its totient is φ = 12224000.

The previous prime is 30639953. The next prime is 30640019. The reversal of 30640000 is 4603.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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 9 ways as a sum of consecutive naturals, for example, 79809 + ... + 80191.

It is an arithmetic number, because the mean of its divisors is an integer number (955944).

Almost surely, 2^30640000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38237760).

30640000 is an abundant number, since it is smaller than the sum of its proper divisors (45835520).

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

30640000 is an frugal number, since it uses more digits than its factorization.

30640000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 30640000 is about 5535.3410012392. The cubic root of 30640000 is about 312.9173091484.

Adding to 30640000 its reverse (4603), we get a palindrome (30644603).

The spelling of 30640000 in words is "thirty million, six hundred forty thousand".