25730720 has 24 divisors (see below), whose sum is σ = 60789204. Its totient is φ = 10292224.

The previous prime is 25730717. The next prime is 25730729. The reversal of 25730720 is 2703752.

It can be written as a sum of positive squares in 2 ways, for example, as 23309584 + 2421136 = 4828^2 + 1556^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25730720.

It is not an unprimeable number, because it can be changed into a prime (25730729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80249 + ... + 80568.

Almost surely, 2^25730720 is an apocalyptic number.

25730720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25730720 is an abundant number, since it is smaller than the sum of its proper divisors (35058484).

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

25730720 is a wasteful number, since it uses less digits than its factorization.

25730720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160832 (or 160824 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 26.

The square root of 25730720 is about 5072.5457119675. The cubic root of 25730720 is about 295.2233107573.

The spelling of 25730720 in words is "twenty-five million, seven hundred thirty thousand, seven hundred twenty".