25215715 has 16 divisors (see below), whose sum is σ = 35170560. Its totient is φ = 16996320.

The previous prime is 25215713. The next prime is 25215719. The reversal of 25215715 is 51751252.

It is not a de Polignac number, because 25215715 - 2¹ = 25215713 is a prime.

It is a super-2 number, since 2×25215715² = 1271664565922450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25215713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4041 + ... + 8170.

It is an arithmetic number, because the mean of its divisors is an integer number (2198160).

Almost surely, 2^25215715 is an apocalyptic number.

25215715 is a deficient number, since it is larger than the sum of its proper divisors (9954845).

25215715 is a wasteful number, since it uses less digits than its factorization.

25215715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12282.

The product of its digits is 3500, while the sum is 28.

The square root of 25215715 is about 5021.5251667198. The cubic root of 25215715 is about 293.2403724309.

Adding to 25215715 its reverse (51751252), we get a palindrome (76966967).

The spelling of 25215715 in words is "twenty-five million, two hundred fifteen thousand, seven hundred fifteen".