30505312 has 24 divisors (see below), whose sum is σ = 61524792. Its totient is φ = 14880000.

The previous prime is 30505309. The next prime is 30505399. The reversal of 30505312 is 21350503.

It is a self number, because there is not a number n which added to its sum of digits gives 30505312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10314 + ... + 12937.

It is an arithmetic number, because the mean of its divisors is an integer number (2563533).

Almost surely, 2^30505312 is an apocalyptic number.

30505312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

30505312 is an abundant number, since it is smaller than the sum of its proper divisors (31019480).

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

30505312 is a wasteful number, since it uses less digits than its factorization.

30505312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23302 (or 23294 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 30505312 is about 5523.1614135384. The cubic root of 30505312 is about 312.4581260159.

Adding to 30505312 its reverse (21350503), we get a palindrome (51855815).

The spelling of 30505312 in words is "thirty million, five hundred five thousand, three hundred twelve".