30812112 has 30 divisors (see below), whose sum is σ = 86231522. Its totient is φ = 10270656.

The previous prime is 30812099. The next prime is 30812113. The reversal of 30812112 is 21121803.

It can be written as a sum of positive squares in only one way, i.e., 30735936 + 76176 = 5544^2 + 276^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30812113) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 106843 + ... + 107130.

Almost surely, 2^30812112 is an apocalyptic number.

It is an amenable number.

30812112 is an abundant number, since it is smaller than the sum of its proper divisors (55419410).

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

30812112 is a wasteful number, since it uses less digits than its factorization.

30812112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213987 (or 213978 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 30812112 is about 5550.8658784013. The cubic root of 30812112 is about 313.5021252422.

Adding to 30812112 its reverse (21121803), we get a palindrome (51933915).

The spelling of 30812112 in words is "thirty million, eight hundred twelve thousand, one hundred twelve".