25720000 has 70 divisors (see below), whose sum is σ = 63876428. Its totient is φ = 10272000.

The previous prime is 25719983. The next prime is 25720001. The reversal of 25720000 is 2752.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (25720001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39679 + ... + 40321.

Almost surely, 2^25720000 is an apocalyptic number.

25720000 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 25720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31938214).

25720000 is an abundant number, since it is smaller than the sum of its proper divisors (38156428).

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

25720000 is an frugal number, since it uses more digits than its factorization.

25720000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 25720000 is about 5071.4889332424. The cubic root of 25720000 is about 295.1823061591.

Adding to 25720000 its reverse (2752), we get a palindrome (25722752).

The spelling of 25720000 in words is "twenty-five million, seven hundred twenty thousand".