25505623 has 8 divisors (see below), whose sum is σ = 29964816. Its totient is φ = 21403200.

The previous prime is 25505611. The next prime is 25505629. The reversal of 25505623 is 32650552.

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

It is not a de Polignac number, because 25505623 - 2⁹ = 25505111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25505591 and 25505600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25505629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89038 + ... + 89323.

It is an arithmetic number, because the mean of its divisors is an integer number (3745602).

Almost surely, 2^25505623 is an apocalyptic number.

25505623 is a deficient number, since it is larger than the sum of its proper divisors (4459193).

25505623 is a wasteful number, since it uses less digits than its factorization.

25505623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178385.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 25505623 is about 5050.3091984551. The cubic root of 25505623 is about 294.3598990786.

Subtracting 25505623 from its reverse (32650552), we obtain a square (7144929 = 2673²).

The spelling of 25505623 in words is "twenty-five million, five hundred five thousand, six hundred twenty-three".