7816225 has 12 divisors (see below), whose sum is σ = 10027260. Its totient is φ = 6036800.

The previous prime is 7816219. The next prime is 7816253. The reversal of 7816225 is 5226187.

It can be written as a sum of positive squares in 6 ways, for example, as 439569 + 7376656 = 663^2 + 2716^2 .

It is not a de Polignac number, because 7816225 - 2³ = 7816217 is a prime.

It is a super-2 number, since 2×7816225² = 122186746501250, which contains 22 as substring.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4666 + ... + 6115.

It is an arithmetic number, because the mean of its divisors is an integer number (835605).

Almost surely, 2^7816225 is an apocalyptic number.

It is an amenable number.

7816225 is a deficient number, since it is larger than the sum of its proper divisors (2211035).

7816225 is a wasteful number, since it uses less digits than its factorization.

7816225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10820 (or 10815 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 7816225 is about 2795.7512407222. The cubic root of 7816225 is about 198.4566628527.

It can be divided in two parts, 78162 and 25, that added together give a palindrome (78187).

The spelling of 7816225 in words is "seven million, eight hundred sixteen thousand, two hundred twenty-five".