25172720 has 40 divisors (see below), whose sum is σ = 61610640. Its totient is φ = 9538560.

The previous prime is 25172717. The next prime is 25172731. The reversal of 25172720 is 2727152.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 25172720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6761 + ... + 9800.

It is an arithmetic number, because the mean of its divisors is an integer number (1540266).

Almost surely, 2^25172720 is an apocalyptic number.

25172720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25172720 is an abundant number, since it is smaller than the sum of its proper divisors (36437920).

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

25172720 is a wasteful number, since it uses less digits than its factorization.

25172720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16593 (or 16587 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 25172720 is about 5017.2422704111. The cubic root of 25172720 is about 293.0736107844.

Adding to 25172720 its reverse (2727152), we get a palindrome (27899872).

The spelling of 25172720 in words is "twenty-five million, one hundred seventy-two thousand, seven hundred twenty".