25801620 has 96 divisors (see below), whose sum is σ = 81943680. Its totient is φ = 6013440.

The previous prime is 25801609. The next prime is 25801651. The reversal of 25801620 is 2610852.

It is a congruent number.

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, 13950 + ... + 15690.

It is an arithmetic number, because the mean of its divisors is an integer number (853580).

Almost surely, 2^25801620 is an apocalyptic number.

25801620 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 25801620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40971840).

25801620 is an abundant number, since it is smaller than the sum of its proper divisors (56142060).

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

25801620 is a wasteful number, since it uses less digits than its factorization.

25801620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785 (or 1783 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 25801620 is about 5079.5295057712. The cubic root of 25801620 is about 295.4942208724.

The spelling of 25801620 in words is "twenty-five million, eight hundred one thousand, six hundred twenty".