30047688 has 72 divisors (see below), whose sum is σ = 89475750. Its totient is φ = 9102720.

The previous prime is 30047671. The next prime is 30047701. The reversal of 30047688 is 88674003.

It can be written as a sum of positive squares in only one way, i.e., 30008484 + 39204 = 5478^2 + 198^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6988 + ... + 10436.

Almost surely, 2^30047688 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 30047688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44737875).

30047688 is an abundant number, since it is smaller than the sum of its proper divisors (59428062).

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

30047688 is a wasteful number, since it uses less digits than its factorization.

30047688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483 (or 3465 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 30047688 is about 5481.5771453114. The cubic root of 30047688 is about 310.8878053271.

The spelling of 30047688 in words is "thirty million, forty-seven thousand, six hundred eighty-eight".