25520406 has 16 divisors (see below), whose sum is σ = 52801200. Its totient is φ = 8213408.

The previous prime is 25520381. The next prime is 25520419. The reversal of 25520406 is 60402552.

It is a super-3 number, since 3×25520406³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73161 + ... + 73508.

It is an arithmetic number, because the mean of its divisors is an integer number (3300075).

Almost surely, 2^25520406 is an apocalyptic number.

25520406 is an abundant number, since it is smaller than the sum of its proper divisors (27280794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25520406 is a wasteful number, since it uses less digits than its factorization.

25520406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146703.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 25520406 is about 5051.7725602010. The cubic root of 25520406 is about 294.4167582000.

Adding to 25520406 its reverse (60402552), we get a palindrome (85922958).

The spelling of 25520406 in words is "twenty-five million, five hundred twenty thousand, four hundred six".