25978290 has 64 divisors (see below), whose sum is σ = 68342400. Its totient is φ = 6280704.

The previous prime is 25978289. The next prime is 25978307. The reversal of 25978290 is 9287952.

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, 22446 + ... + 23574.

It is an arithmetic number, because the mean of its divisors is an integer number (1067850).

Almost surely, 2^25978290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25978290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34171200).

25978290 is an abundant number, since it is smaller than the sum of its proper divisors (42364110).

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

25978290 is a wasteful number, since it uses less digits than its factorization.

25978290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 25978290 is about 5096.8902283647. The cubic root of 25978290 is about 296.1671277392.

The spelling of 25978290 in words is "twenty-five million, nine hundred seventy-eight thousand, two hundred ninety".