25621224 has 16 divisors (see below), whose sum is σ = 64053120. Its totient is φ = 8540400.

The previous prime is 25621199. The next prime is 25621237. The reversal of 25621224 is 42212652.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 1067551 = 25621224 / (2 + 5 + 6 + 2 + 1 + 2 + 2 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 25621194 and 25621203.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 533752 + ... + 533799.

It is an arithmetic number, because the mean of its divisors is an integer number (4003320).

Almost surely, 2^25621224 is an apocalyptic number.

25621224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25621224 is an abundant number, since it is smaller than the sum of its proper divisors (38431896).

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

25621224 is a wasteful number, since it uses less digits than its factorization.

25621224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067560 (or 1067556 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 25621224 is about 5061.7412023927. The cubic root of 25621224 is about 294.8039451895.

Adding to 25621224 its reverse (42212652), we get a palindrome (67833876).

The spelling of 25621224 in words is "twenty-five million, six hundred twenty-one thousand, two hundred twenty-four".