25215330 has 64 divisors (see below), whose sum is σ = 69672960. Its totient is φ = 5721024.

The previous prime is 25215319. The next prime is 25215331. The reversal of 25215330 is 3351252.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 25215297 and 25215306.

It is not an unprimeable number, because it can be changed into a prime (25215331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34711 + ... + 35429.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^25215330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25215330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34836480).

25215330 is an abundant number, since it is smaller than the sum of its proper divisors (44457630).

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

25215330 is a wasteful number, since it uses less digits than its factorization.

25215330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 25215330 is about 5021.4868316068. The cubic root of 25215330 is about 293.2388800002.

Adding to 25215330 its reverse (3351252), we get a palindrome (28566582).

The spelling of 25215330 in words is "twenty-five million, two hundred fifteen thousand, three hundred thirty".