7812500 has 30 divisors (see below), whose sum is σ = 17089842. Its totient is φ = 3125000.

The previous prime is 7812499. The next prime is 7812521. The reversal of 7812500 is 52187.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 2062096 + 5750404 = 1436^2 + 2398^2 .

It is a super-2 number, since 2×7812500² = 122070312500000, which contains 22 as substring.

It is a nialpdrome in base 5.

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 9 ways as a sum of consecutive naturals, for example, 1562498 + ... + 1562502.

Almost surely, 2^7812500 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 7812500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8544921).

7812500 is an abundant number, since it is smaller than the sum of its proper divisors (9277342).

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

7812500 is an frugal number, since it uses more digits than its factorization.

7812500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 7812500 is about 2795.0849718747. The cubic root of 7812500 is about 198.4251314960.

Adding to 7812500 its reverse (52187), we get a palindrome (7864687).

The spelling of 7812500 in words is "seven million, eight hundred twelve thousand, five hundred".