7210557225 has 189 divisors, whose sum is σ = 14635727967. Its totient is φ = 3521594880.

The previous prime is 7210557143. The next prime is 7210557229. The reversal of 7210557225 is 5227550127.

The square root of 7210557225 is 84915.

It is a perfect power (a square), and thus also a powerful number.

7210557225 is a `hidden beast` number, since 72 + 10 + 5 + 572 + 2 + 5 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 222934761 + 6987622464 = 14931^2 + 83592^2 .

It is not a de Polignac number, because 7210557225 - 2⁷ = 7210557097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7210557225.

It is not an unprimeable number, because it can be changed into a prime (7210557229) by changing a digit.

It is a polite number, since it can be written in 188 ways as a sum of consecutive naturals, for example, 194879907 + ... + 194879943.

Almost surely, 2^7210557225 is an apocalyptic number.

7210557225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

7210557225 is the 84915-th square number.

7210557225 is the 42458-th centered octagonal number.

It is an amenable number.

7210557225 is an abundant number, since it is smaller than the sum of its proper divisors (7425170742).

7210557225 is an equidigital number, since it uses as much as digits as its factorization.

7210557225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 62 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 36.

The cubic root of 7210557225 is about 1931.9220942892.

Multiplying 7210557225 by its sum of digits (36), we get a square (259580060100 = 509490²).

The spelling of 7210557225 in words is "seven billion, two hundred ten million, five hundred fifty-seven thousand, two hundred twenty-five".