25491330 has 48 divisors (see below), whose sum is σ = 70180344. Its totient is φ = 6397440.

The previous prime is 25491329. The next prime is 25491371. The reversal of 25491330 is 3319452.

It can be written as a sum of positive squares in 4 ways, for example, as 22953681 + 2537649 = 4791^2 + 1593^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25491294 and 25491303.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6801 + ... + 9860.

Almost surely, 2^25491330 is an apocalyptic number.

25491330 is an abundant number, since it is smaller than the sum of its proper divisors (44689014).

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

25491330 is a wasteful number, since it uses less digits than its factorization.

25491330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16691 (or 16688 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 25491330 is about 5048.8939382799. The cubic root of 25491330 is about 294.3049037260.

The spelling of 25491330 in words is "twenty-five million, four hundred ninety-one thousand, three hundred thirty".