25520824 has 64 divisors (see below), whose sum is σ = 57182400. Its totient is φ = 10450944.

The previous prime is 25520779. The next prime is 25520827. The reversal of 25520824 is 42802552.

25520824 = T₁₇ + T₁₈ + ... + T₅₃₄.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 25520792 and 25520801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25520827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225792 + ... + 225904.

It is an arithmetic number, because the mean of its divisors is an integer number (893475).

Almost surely, 2^25520824 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25520824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28591200).

25520824 is an abundant number, since it is smaller than the sum of its proper divisors (31661576).

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

25520824 is a wasteful number, since it uses less digits than its factorization.

25520824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 25520824 is about 5051.8139316487. The cubic root of 25520824 is about 294.4183656135.

The spelling of 25520824 in words is "twenty-five million, five hundred twenty thousand, eight hundred twenty-four".