15750225 has 18 divisors (see below), whose sum is σ = 28210806. Its totient is φ = 8400000.

The previous prime is 15750223. The next prime is 15750233. The reversal of 15750225 is 52205751.

It is a happy number.

15750225 is a `hidden beast` number, since 157 + 502 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 3069504 + 12680721 = 1752^2 + 3561^2 .

It is not a de Polignac number, because 15750225 - 2¹ = 15750223 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15750223) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 34776 + ... + 35225.

It is an arithmetic number, because the mean of its divisors is an integer number (1567267).

Almost surely, 2^15750225 is an apocalyptic number.

15750225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15750225 is a deficient number, since it is larger than the sum of its proper divisors (12460581).

15750225 is a wasteful number, since it uses less digits than its factorization.

15750225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70017 (or 70009 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 15750225 is about 3968.6553138311. The cubic root of 15750225 is about 250.6660903849. Note that the first 3 decimals are identical.

Adding to 15750225 its reverse (52205751), we get a palindrome (67955976).

The spelling of 15750225 in words is "fifteen million, seven hundred fifty thousand, two hundred twenty-five".