25749420 has 96 divisors (see below), whose sum is σ = 77027328. Its totient is φ = 6412032.

The previous prime is 25749401. The next prime is 25749421. The reversal of 25749420 is 2494752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25749421) 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 31 ways as a sum of consecutive naturals, for example, 64662 + ... + 65058.

It is an arithmetic number, because the mean of its divisors is an integer number (802368).

Almost surely, 2^25749420 is an apocalyptic number.

25749420 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 25749420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38513664).

25749420 is an abundant number, since it is smaller than the sum of its proper divisors (51277908).

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

25749420 is a wasteful number, since it uses less digits than its factorization.

25749420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 25749420 is about 5074.3886331262. The cubic root of 25749420 is about 295.2948120477.

The spelling of 25749420 in words is "twenty-five million, seven hundred forty-nine thousand, four hundred twenty".