25520040 has 384 divisors, whose sum is σ = 110073600. Its totient is φ = 4976640.

The previous prime is 25520017. The next prime is 25520051. The reversal of 25520040 is 4002552.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 25519995 and 25520022.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 622420 + ... + 622460.

It is an arithmetic number, because the mean of its divisors is an integer number (286650).

Almost surely, 2^25520040 is an apocalyptic number.

25520040 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 25520040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55036800).

25520040 is an abundant number, since it is smaller than the sum of its proper divisors (84553560).

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

25520040 is a wasteful number, since it uses less digits than its factorization.

25520040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 25520040 is about 5051.7363351624. The cubic root of 25520040 is about 294.4153507374.

Adding to 25520040 its reverse (4002552), we get a palindrome (29522592).

The spelling of 25520040 in words is "twenty-five million, five hundred twenty thousand, forty".