25623215 has 4 divisors (see below), whose sum is σ = 30747864. Its totient is φ = 20498568.

The previous prime is 25623197. The next prime is 25623217. The reversal of 25623215 is 51232652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25623215 - 2⁸ = 25622959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25623217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2562317 + ... + 2562326.

It is an arithmetic number, because the mean of its divisors is an integer number (7686966).

Almost surely, 2^25623215 is an apocalyptic number.

25623215 is a deficient number, since it is larger than the sum of its proper divisors (5124649).

25623215 is an equidigital number, since it uses as much as digits as its factorization.

25623215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124648.

The product of its digits is 3600, while the sum is 26.

The square root of 25623215 is about 5061.9378700257. The cubic root of 25623215 is about 294.8115812995.

Adding to 25623215 its reverse (51232652), we get a palindrome (76855867).

The spelling of 25623215 in words is "twenty-five million, six hundred twenty-three thousand, two hundred fifteen".