25720002 has 108 divisors (see below), whose sum is σ = 71549478. Its totient is φ = 6652800.

The previous prime is 25720001. The next prime is 25720007. The reversal of 25720002 is 20002752.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19263321 + 6456681 = 4389^2 + 2541^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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 53 ways as a sum of consecutive naturals, for example, 106602 + ... + 106842.

Almost surely, 2^25720002 is an apocalyptic number.

25720002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 25720002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35774739).

25720002 is an abundant number, since it is smaller than the sum of its proper divisors (45829476).

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

25720002 is a wasteful number, since it uses less digits than its factorization.

25720002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 25720002 is about 5071.4891304231. The cubic root of 25720002 is about 295.1823138103.

Adding to 25720002 its reverse (20002752), we get a palindrome (45722754).

It can be divided in two parts, 25 and 720002, that added together give a palindrome (720027).

The spelling of 25720002 in words is "twenty-five million, seven hundred twenty thousand, two".