30987288 has 48 divisors (see below), whose sum is σ = 85718880. Its totient is φ = 10108224.

The previous prime is 30987263. The next prime is 30987289. The reversal of 30987288 is 88278903.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30987289) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1195 + ... + 7962.

It is an arithmetic number, because the mean of its divisors is an integer number (1785810).

Almost surely, 2^30987288 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 30987288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42859440).

30987288 is an abundant number, since it is smaller than the sum of its proper divisors (54731592).

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

30987288 is a wasteful number, since it uses less digits than its factorization.

30987288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9216 (or 9209 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 30987288 is about 5566.6226744769. The cubic root of 30987288 is about 314.0951204106.

The spelling of 30987288 in words is "thirty million, nine hundred eighty-seven thousand, two hundred eighty-eight".