25899840 has 252 divisors, whose sum is σ = 98604324. Its totient is φ = 6217728.

The previous prime is 25899829. The next prime is 25899893. The reversal of 25899840 is 4899852.

It can be written as a sum of positive squares in 2 ways, for example, as 14930496 + 10969344 = 3864^2 + 3312^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1126069 + ... + 1126091.

It is an arithmetic number, because the mean of its divisors is an integer number (391287).

Almost surely, 2^25899840 is an apocalyptic number.

25899840 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 25899840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49302162).

25899840 is an abundant number, since it is smaller than the sum of its proper divisors (72704484).

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

25899840 is a wasteful number, since it uses less digits than its factorization.

25899840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 25899840 is about 5089.1885404257. The cubic root of 25899840 is about 295.8687024211.

The spelling of 25899840 in words is "twenty-five million, eight hundred ninety-nine thousand, eight hundred forty".