25604540 has 24 divisors (see below), whose sum is σ = 57906240. Its totient is φ = 9453888.

The previous prime is 25604539. The next prime is 25604561. The reversal of 25604540 is 4540652.

It is a super-2 number, since 2×25604540² = 1311184937223200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48980 + ... + 49499.

It is an arithmetic number, because the mean of its divisors is an integer number (2412760).

Almost surely, 2^25604540 is an apocalyptic number.

25604540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25604540 is an abundant number, since it is smaller than the sum of its proper divisors (32301700).

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

25604540 is a wasteful number, since it uses less digits than its factorization.

25604540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98501 (or 98499 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 25604540 is about 5060.0928845230. The cubic root of 25604540 is about 294.7399412604.

The spelling of 25604540 in words is "twenty-five million, six hundred four thousand, five hundred forty".