30812500 has 84 divisors (see below), whose sum is σ = 73827180. Its totient is φ = 11200000.

The previous prime is 30812491. The next prime is 30812513. The reversal of 30812500 is 521803.

It is a happy number.

It can be written as a sum of positive squares in 14 ways, for example, as 28686736 + 2125764 = 5356^2 + 1458^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1062486 + ... + 1062514.

It is an arithmetic number, because the mean of its divisors is an integer number (878895).

Almost surely, 2^30812500 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 30812500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36913590).

30812500 is an abundant number, since it is smaller than the sum of its proper divisors (43014680).

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

30812500 is an equidigital number, since it uses as much as digits as its factorization.

30812500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 30812500 is about 5550.9008277936. The cubic root of 30812500 is about 313.5034411567.

The spelling of 30812500 in words is "thirty million, eight hundred twelve thousand, five hundred".