30312500 has 48 divisors (see below), whose sum is σ = 66992016. Its totient is φ = 12000000.

The previous prime is 30312493. The next prime is 30312539. The reversal of 30312500 is 521303.

It can be written as a sum of positive squares in 8 ways, for example, as 22771984 + 7540516 = 4772^2 + 2746^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312452 + ... + 312548.

It is an arithmetic number, because the mean of its divisors is an integer number (1395667).

Almost surely, 2^30312500 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 30312500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33496008).

30312500 is an abundant number, since it is smaller than the sum of its proper divisors (36679516).

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

30312500 is an frugal number, since it uses more digits than its factorization.

30312500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 30312500 is about 5505.6788863863. The cubic root of 30312500 is about 311.7984261198.

Adding to 30312500 its reverse (521303), we get a palindrome (30833803).

The spelling of 30312500 in words is "thirty million, three hundred twelve thousand, five hundred".