25478990238 has 32 divisors (see below), whose sum is σ = 55539017856. Its totient is φ = 7745233248.

The previous prime is 25478990219. The next prime is 25478990249. The reversal of 25478990238 is 83209987452.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1961320 + ... + 1974267.

It is an arithmetic number, because the mean of its divisors is an integer number (1735594308).

Almost surely, 2^25478990238 is an apocalyptic number.

25478990238 is an abundant number, since it is smaller than the sum of its proper divisors (30060027618).

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

25478990238 is a wasteful number, since it uses less digits than its factorization.

25478990238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3935688.

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 25478990238 in words is "twenty-five billion, four hundred seventy-eight million, nine hundred ninety thousand, two hundred thirty-eight".