30313312 has 48 divisors (see below), whose sum is σ = 63921312. Its totient is φ = 14100480.

The previous prime is 30313307. The next prime is 30313313. The reversal of 30313312 is 21331303.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30313313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55762 + ... + 56302.

It is an arithmetic number, because the mean of its divisors is an integer number (1331694).

Almost surely, 2^30313312 is an apocalyptic number.

30313312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30313312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31960656).

30313312 is an abundant number, since it is smaller than the sum of its proper divisors (33608000).

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

30313312 is a wasteful number, since it uses less digits than its factorization.

30313312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 30313312 is about 5505.7526279338. The cubic root of 30313312 is about 311.8012102084.

Adding to 30313312 its reverse (21331303), we get a palindrome (51644615).

Subtracting from 30313312 its reverse (21331303), we obtain a square (8982009 = 2997²).

It can be divided in two parts, 30313 and 312, that added together give a square (30625 = 175²).

The spelling of 30313312 in words is "thirty million, three hundred thirteen thousand, three hundred twelve".