30312220 has 24 divisors (see below), whose sum is σ = 67006800. Its totient is φ = 11486592.

The previous prime is 30312211. The next prime is 30312263. The reversal of 30312220 is 2221303.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 30312220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39505 + ... + 40264.

It is an arithmetic number, because the mean of its divisors is an integer number (2791950).

Almost surely, 2^30312220 is an apocalyptic number.

It is an amenable number.

30312220 is an abundant number, since it is smaller than the sum of its proper divisors (36694580).

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

30312220 is a wasteful number, since it uses less digits than its factorization.

30312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79797 (or 79795 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 30312220 is about 5505.6534580375. The cubic root of 30312220 is about 311.7974660777.

Adding to 30312220 its reverse (2221303), we get a palindrome (32533523).

The spelling of 30312220 in words is "thirty million, three hundred twelve thousand, two hundred twenty".