25504500 has 144 divisors (see below), whose sum is σ = 86643648. Its totient is φ = 5812800.

The previous prime is 25504499. The next prime is 25504511. The reversal of 25504500 is 540552.

25504500 = T₄₀₉ + T₄₁₀ + ... + T₆₀₄.

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 47 ways as a sum of consecutive naturals, for example, 73327 + ... + 73673.

It is an arithmetic number, because the mean of its divisors is an integer number (601692).

Almost surely, 2^25504500 is an apocalyptic number.

25504500 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 25504500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43321824).

25504500 is an abundant number, since it is smaller than the sum of its proper divisors (61139148).

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

25504500 is a wasteful number, since it uses less digits than its factorization.

25504500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 25504500 is about 5050.1980159198. The cubic root of 25504500 is about 294.3555788414.

The spelling of 25504500 in words is "twenty-five million, five hundred four thousand, five hundred".