25901988 has 120 divisors (see below), whose sum is σ = 75290880. Its totient is φ = 6914880.

The previous prime is 25901987. The next prime is 25902013. The reversal of 25901988 is 88910952.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (25901983) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 835533 + ... + 835563.

It is an arithmetic number, because the mean of its divisors is an integer number (627424).

Almost surely, 2^25901988 is an apocalyptic number.

25901988 is a gapful number since it is divisible by the number (28) 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 25901988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37645440).

25901988 is an abundant number, since it is smaller than the sum of its proper divisors (49388892).

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

25901988 is a wasteful number, since it uses less digits than its factorization.

25901988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 25901988 is about 5089.3995716587. The cubic root of 25901988 is about 295.8768814730.

The spelling of 25901988 in words is "twenty-five million, nine hundred one thousand, nine hundred eighty-eight".