25721120 has 24 divisors (see below), whose sum is σ = 60766524. Its totient is φ = 10288384.

The previous prime is 25721071. The next prime is 25721147. The reversal of 25721120 is 2112752.

It can be written as a sum of positive squares in 2 ways, for example, as 20757136 + 4963984 = 4556^2 + 2228^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 25721092 and 25721101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80219 + ... + 80538.

Almost surely, 2^25721120 is an apocalyptic number.

25721120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25721120 is an abundant number, since it is smaller than the sum of its proper divisors (35045404).

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

25721120 is a wasteful number, since it uses less digits than its factorization.

25721120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160772 (or 160764 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 25721120 is about 5071.5993532613. The cubic root of 25721120 is about 295.1865907546.

Adding to 25721120 its reverse (2112752), we get a palindrome (27833872).

The spelling of 25721120 in words is "twenty-five million, seven hundred twenty-one thousand, one hundred twenty".