25920215 has 8 divisors (see below), whose sum is σ = 31395600. Its totient is φ = 20541952.

The previous prime is 25920211. The next prime is 25920217. The reversal of 25920215 is 51202952.

25920215 = 236² + 237² + ... + 449².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25920215 - 2² = 25920211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25920211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23690 + ... + 24759.

It is an arithmetic number, because the mean of its divisors is an integer number (3924450).

Almost surely, 2^25920215 is an apocalyptic number.

25920215 is a deficient number, since it is larger than the sum of its proper divisors (5475385).

25920215 is a wasteful number, since it uses less digits than its factorization.

25920215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48561.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 25920215 is about 5091.1899394935. The cubic root of 25920215 is about 295.9462671822.

The spelling of 25920215 in words is "twenty-five million, nine hundred twenty thousand, two hundred fifteen".