25021632 has 70 divisors (see below), whose sum is σ = 69880988. Its totient is φ = 7901568.

The previous prime is 25021609. The next prime is 25021643. The reversal of 25021632 is 23612052.

It is a junction number, because it is equal to n+sod(n) for n = 25021599 and 25021608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1316919 + ... + 1316937.

Almost surely, 2^25021632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25021632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34940494).

25021632 is an abundant number, since it is smaller than the sum of its proper divisors (44859356).

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

25021632 is an frugal number, since it uses more digits than its factorization.

25021632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 24 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 25021632 is about 5002.1627322589. The cubic root of 25021632 is about 292.4860859770.

Adding to 25021632 its reverse (23612052), we get a palindrome (48633684).

The spelling of 25021632 in words is "twenty-five million, twenty-one thousand, six hundred thirty-two".