25540224 has 64 divisors (see below), whose sum is σ = 68372640. Its totient is φ = 8446976.

The previous prime is 25540217. The next prime is 25540243. The reversal of 25540224 is 42204552.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 25540194 and 25540203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87022 + ... + 87314.

Almost surely, 2^25540224 is an apocalyptic number.

25540224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25540224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34186320).

25540224 is an abundant number, since it is smaller than the sum of its proper divisors (42832416).

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

25540224 is a wasteful number, since it uses less digits than its factorization.

25540224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 525 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 25540224 is about 5053.7336692786. The cubic root of 25540224 is about 294.4929487542.

Adding to 25540224 its reverse (42204552), we get a palindrome (67744776).

The spelling of 25540224 in words is "twenty-five million, five hundred forty thousand, two hundred twenty-four".