25491290 has 64 divisors (see below), whose sum is σ = 53032320. Its totient is φ = 8736000.

The previous prime is 25491259. The next prime is 25491311. The reversal of 25491290 is 9219452.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194525 + ... + 194655.

It is an arithmetic number, because the mean of its divisors is an integer number (828630).

Almost surely, 2^25491290 is an apocalyptic number.

25491290 is an abundant number, since it is smaller than the sum of its proper divisors (27541030).

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

25491290 is a wasteful number, since it uses less digits than its factorization.

25491290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 25491290 is about 5048.8899770147. The cubic root of 25491290 is about 294.3047497887.

The spelling of 25491290 in words is "twenty-five million, four hundred ninety-one thousand, two hundred ninety".