25242720 has 96 divisors (see below), whose sum is σ = 81430272. Its totient is φ = 6569472.

The previous prime is 25242709. The next prime is 25242779. The reversal of 25242720 is 2724252.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20029 + ... + 21251.

It is an arithmetic number, because the mean of its divisors is an integer number (848232).

Almost surely, 2^25242720 is an apocalyptic number.

25242720 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 25242720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40715136).

25242720 is an abundant number, since it is smaller than the sum of its proper divisors (56187552).

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

25242720 is a wasteful number, since it uses less digits than its factorization.

25242720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284 (or 1276 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 25242720 is about 5024.2133712652. The cubic root of 25242720 is about 293.3450179000.

Adding to 25242720 its reverse (2724252), we get a palindrome (27966972).

The spelling of 25242720 in words is "twenty-five million, two hundred forty-two thousand, seven hundred twenty".