30013656 has 64 divisors (see below), whose sum is σ = 77721600. Its totient is φ = 9652608.

The previous prime is 30013639. The next prime is 30013657. The reversal of 30013656 is 65631003.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30013657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130950 + ... + 131178.

It is an arithmetic number, because the mean of its divisors is an integer number (1214400).

Almost surely, 2^30013656 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 30013656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38860800).

30013656 is an abundant number, since it is smaller than the sum of its proper divisors (47707944).

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

30013656 is a wasteful number, since it uses less digits than its factorization.

30013656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 30013656 is about 5478.4720497599. The cubic root of 30013656 is about 310.7703905180.

Adding to 30013656 its reverse (65631003), we get a palindrome (95644659).

The spelling of 30013656 in words is "thirty million, thirteen thousand, six hundred fifty-six".