25223520 has 96 divisors (see below), whose sum is σ = 90816768. Its totient is φ = 5764608.

The previous prime is 25223509. The next prime is 25223551. The reversal of 25223520 is 2532252.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×25223520² = 1272451922380800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394 + ... + 7113.

It is an arithmetic number, because the mean of its divisors is an integer number (946008).

Almost surely, 2^25223520 is an apocalyptic number.

25223520 is a gapful number since it is divisible by the number (20) 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 25223520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45408384).

25223520 is an abundant number, since it is smaller than the sum of its proper divisors (65593248).

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

25223520 is a wasteful number, since it uses less digits than its factorization.

25223520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7532 (or 7524 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 25223520 is about 5022.3022609158. The cubic root of 25223520 is about 293.2706247954.

Adding to 25223520 its reverse (2532252), we get a palindrome (27755772).

The spelling of 25223520 in words is "twenty-five million, two hundred twenty-three thousand, five hundred twenty".