25404420 has 96 divisors (see below), whose sum is σ = 76204800. Its totient is φ = 6307840.

The previous prime is 25404419. The next prime is 25404451. The reversal of 25404420 is 2440452.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56356 + ... + 56804.

It is an arithmetic number, because the mean of its divisors is an integer number (793800).

Almost surely, 2^25404420 is an apocalyptic number.

25404420 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 25404420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38102400).

25404420 is an abundant number, since it is smaller than the sum of its proper divisors (50800380).

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

25404420 is a wasteful number, since it uses less digits than its factorization.

25404420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 25404420 is about 5040.2797541406. The cubic root of 25404420 is about 293.9700557220.

Adding to 25404420 its reverse (2440452), we get a palindrome (27844872).

The spelling of 25404420 in words is "twenty-five million, four hundred four thousand, four hundred twenty".