25861550 has 48 divisors (see below), whose sum is σ = 56527632. Its totient is φ = 8678400.

The previous prime is 25861547. The next prime is 25861553. The reversal of 25861550 is 5516852.

It is an interprime number because it is at equal distance from previous prime (25861547) and next prime (25861553).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25861553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5342 + ... + 8958.

It is an arithmetic number, because the mean of its divisors is an integer number (1177659).

Almost surely, 2^25861550 is an apocalyptic number.

25861550 is an abundant number, since it is smaller than the sum of its proper divisors (30666082).

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

25861550 is a wasteful number, since it uses less digits than its factorization.

25861550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653 (or 3648 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 25861550 is about 5085.4252526215. The cubic root of 25861550 is about 295.7228276461.

The spelling of 25861550 in words is "twenty-five million, eight hundred sixty-one thousand, five hundred fifty".