25421720 has 32 divisors (see below), whose sum is σ = 57628800. Its totient is φ = 10092288.

The previous prime is 25421687. The next prime is 25421731. The reversal of 25421720 is 2712452.

It is a happy number.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3161 + ... + 7799.

It is an arithmetic number, because the mean of its divisors is an integer number (1800900).

Almost surely, 2^25421720 is an apocalyptic number.

25421720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25421720 is an abundant number, since it is smaller than the sum of its proper divisors (32207080).

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

25421720 is a wasteful number, since it uses less digits than its factorization.

25421720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4787 (or 4783 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 25421720 is about 5041.9956366502. The cubic root of 25421720 is about 294.0367702016.

The spelling of 25421720 in words is "twenty-five million, four hundred twenty-one thousand, seven hundred twenty".