25721370 has 48 divisors (see below), whose sum is σ = 67223520. Its totient is φ = 6823392.

The previous prime is 25721369. The next prime is 25721417. The reversal of 25721370 is 7312752.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19801 + ... + 21059.

It is an arithmetic number, because the mean of its divisors is an integer number (1400490).

Almost surely, 2^25721370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25721370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33611760).

25721370 is an abundant number, since it is smaller than the sum of its proper divisors (41502150).

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

25721370 is a wasteful number, since it uses less digits than its factorization.

25721370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499 (or 1496 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 25721370 is about 5071.6240002587. The cubic root of 25721370 is about 295.1875471205.

The spelling of 25721370 in words is "twenty-five million, seven hundred twenty-one thousand, three hundred seventy".